How to return an object from an array in JavaScript












8














Create a function that takes an array of people objects and returns the first found astronaut object from the array.



This is the code that I have created;



function findFirstAstronaut(people) {
for (let i = 0; i < people.length; i++) {
if (people.astronaut[i] === false) {
return null
}
else if (people.astronaut[i]) {
return people[i]
}
}


My code is run against this test;



describe("findFirstAstronaut", () => {
it("returns null if no Astronaut is in the array", () => {
expect(findFirstAstronaut()).to.be.null;
});

it("returns a person object who is an astronaut", () => {
const astronaut = { name: "Tim Peake", isAstronaut: true };
expect(findFirstAstronaut([astronaut])).to.have.keys([
"name",
"isAstronaut"
]);
expect(findFirstAstronaut([astronaut]).isAstronaut).to.be.true;
});

it("returns the first astronaut from the array", () => {
const astronauts = [
{ name: "Johnny Karate", isAstronaut: false },
{ name: "Neil Armstrong", isAstronaut: true },
{ name: "Valentina Tereshkova", isAstronaut: true },
{ name: "Bert Macklin", isAstronaut: false },
{ name: "Eileen Collins", isAstronaut: true },
{ name: "Kip Hackman", isAstronaut: false }
];
expect(findFirstAstronaut(astronauts)).to.eql({
name: "Neil Armstrong",
isAstronaut: true
});
});
});


How do I fix my code?










share|improve this question









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  • Is that a particular unit test framework?
    – Peter Mortensen
    51 mins ago
















8














Create a function that takes an array of people objects and returns the first found astronaut object from the array.



This is the code that I have created;



function findFirstAstronaut(people) {
for (let i = 0; i < people.length; i++) {
if (people.astronaut[i] === false) {
return null
}
else if (people.astronaut[i]) {
return people[i]
}
}


My code is run against this test;



describe("findFirstAstronaut", () => {
it("returns null if no Astronaut is in the array", () => {
expect(findFirstAstronaut()).to.be.null;
});

it("returns a person object who is an astronaut", () => {
const astronaut = { name: "Tim Peake", isAstronaut: true };
expect(findFirstAstronaut([astronaut])).to.have.keys([
"name",
"isAstronaut"
]);
expect(findFirstAstronaut([astronaut]).isAstronaut).to.be.true;
});

it("returns the first astronaut from the array", () => {
const astronauts = [
{ name: "Johnny Karate", isAstronaut: false },
{ name: "Neil Armstrong", isAstronaut: true },
{ name: "Valentina Tereshkova", isAstronaut: true },
{ name: "Bert Macklin", isAstronaut: false },
{ name: "Eileen Collins", isAstronaut: true },
{ name: "Kip Hackman", isAstronaut: false }
];
expect(findFirstAstronaut(astronauts)).to.eql({
name: "Neil Armstrong",
isAstronaut: true
});
});
});


How do I fix my code?










share|improve this question









New contributor




Georgia Lumley is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.




















  • Is that a particular unit test framework?
    – Peter Mortensen
    51 mins ago














8












8








8


1





Create a function that takes an array of people objects and returns the first found astronaut object from the array.



This is the code that I have created;



function findFirstAstronaut(people) {
for (let i = 0; i < people.length; i++) {
if (people.astronaut[i] === false) {
return null
}
else if (people.astronaut[i]) {
return people[i]
}
}


My code is run against this test;



describe("findFirstAstronaut", () => {
it("returns null if no Astronaut is in the array", () => {
expect(findFirstAstronaut()).to.be.null;
});

it("returns a person object who is an astronaut", () => {
const astronaut = { name: "Tim Peake", isAstronaut: true };
expect(findFirstAstronaut([astronaut])).to.have.keys([
"name",
"isAstronaut"
]);
expect(findFirstAstronaut([astronaut]).isAstronaut).to.be.true;
});

it("returns the first astronaut from the array", () => {
const astronauts = [
{ name: "Johnny Karate", isAstronaut: false },
{ name: "Neil Armstrong", isAstronaut: true },
{ name: "Valentina Tereshkova", isAstronaut: true },
{ name: "Bert Macklin", isAstronaut: false },
{ name: "Eileen Collins", isAstronaut: true },
{ name: "Kip Hackman", isAstronaut: false }
];
expect(findFirstAstronaut(astronauts)).to.eql({
name: "Neil Armstrong",
isAstronaut: true
});
});
});


How do I fix my code?










share|improve this question









New contributor




Georgia Lumley is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











Create a function that takes an array of people objects and returns the first found astronaut object from the array.



This is the code that I have created;



function findFirstAstronaut(people) {
for (let i = 0; i < people.length; i++) {
if (people.astronaut[i] === false) {
return null
}
else if (people.astronaut[i]) {
return people[i]
}
}


My code is run against this test;



describe("findFirstAstronaut", () => {
it("returns null if no Astronaut is in the array", () => {
expect(findFirstAstronaut()).to.be.null;
});

it("returns a person object who is an astronaut", () => {
const astronaut = { name: "Tim Peake", isAstronaut: true };
expect(findFirstAstronaut([astronaut])).to.have.keys([
"name",
"isAstronaut"
]);
expect(findFirstAstronaut([astronaut]).isAstronaut).to.be.true;
});

it("returns the first astronaut from the array", () => {
const astronauts = [
{ name: "Johnny Karate", isAstronaut: false },
{ name: "Neil Armstrong", isAstronaut: true },
{ name: "Valentina Tereshkova", isAstronaut: true },
{ name: "Bert Macklin", isAstronaut: false },
{ name: "Eileen Collins", isAstronaut: true },
{ name: "Kip Hackman", isAstronaut: false }
];
expect(findFirstAstronaut(astronauts)).to.eql({
name: "Neil Armstrong",
isAstronaut: true
});
});
});


How do I fix my code?







javascript arrays loops object






share|improve this question









New contributor




Georgia Lumley is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









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share|improve this question




share|improve this question








edited 52 mins ago









Peter Mortensen

13.4k1983111




13.4k1983111






New contributor




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asked 7 hours ago









Georgia Lumley

1127




1127




New contributor




Georgia Lumley is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





Georgia Lumley is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






Georgia Lumley is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












  • Is that a particular unit test framework?
    – Peter Mortensen
    51 mins ago


















  • Is that a particular unit test framework?
    – Peter Mortensen
    51 mins ago
















Is that a particular unit test framework?
– Peter Mortensen
51 mins ago




Is that a particular unit test framework?
– Peter Mortensen
51 mins ago












5 Answers
5






active

oldest

votes


















1














You need to use the index for the array.




people[i]                // for the object
people[i].isAstronaut // for a property of the object



Then you need only a check if isAstronaut is true and return with the item.



At the end outside of the for loop, return null, for a not found astronaut.



If you check inside the loop, you will return too early with the wrong result.



function findFirstAstronaut(people) {
for (let i = 0; i < people.length; i++) {
if (people[i].isAstronaut) {
return people[i];
}
}
return null;
}





share|improve this answer





























    5














    ES6 introduces a new way to achieve this, if ES6 is an option for you:



    myArray.find(item => {
    return item.isAstronaut
    })


    Or even more abbreviated:



    myArray.find(item => item.isAstronaut)


    find() is a one of the new iterators, along with filter() and map() and others for more easily working with arrays. find() will return the first item in your array that matches the condition. The => or "arrow function" means that you do not need to explicitly include the return statement.



    Read more about ES6 iterators.






    share|improve this answer





























      0














      You could simply filter out array elements that have an isAstronaut property equal to false using Array.prototype.filter. I prefer filter to Array.prototype.find since ES6 isn't supported in every browser.



      Once you have the filtered array simply take the element in the 0 index position. Something like below:






      const astronauts = [{
      name: "Johnny Karate",
      isAstronaut: false
      },
      {
      name: "Neil Armstrong",
      isAstronaut: true
      },
      {
      name: "Valentina Tereshkova",
      isAstronaut: true
      },
      {
      name: "Bert Macklin",
      isAstronaut: false
      },
      {
      name: "Eileen Collins",
      isAstronaut: true
      },
      {
      name: "Kip Hackman",
      isAstronaut: false
      }
      ];

      //Array destructuring to get the first astronaut:
      var [firstAstronautFound] = astronauts.filter(el => el.isAstronaut);

      //Line above is same as doing this:
      //var firstAstronautFound = astronauts.filter(el => el.isAstronaut)[0];

      console.log(firstAstronautFound.name);








      share|improve this answer





























        0














        First, you may need to check whether there is any item in array or else return null.



        Second, you have to check for the property



        Third, you have to check for the value of the property isAstronaut



        function findFirstAstronaut(people) {
        if (people.length > 0)
        {
        for (let i = 0; i < people.length; i++) {
        if (("name" in people[i]) && ("isAstronaut" in people[i])) {
        if (people[i].isAstronaut)
        return people[i];
        else
        return true;
        }
        }
        }
        else
        return null;
        }





        share|improve this answer





























          0














          One liner



          arr.filter(item => item.isAstronaut)[0]





          share|improve this answer








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            5 Answers
            5






            active

            oldest

            votes








            5 Answers
            5






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            1














            You need to use the index for the array.




            people[i]                // for the object
            people[i].isAstronaut // for a property of the object



            Then you need only a check if isAstronaut is true and return with the item.



            At the end outside of the for loop, return null, for a not found astronaut.



            If you check inside the loop, you will return too early with the wrong result.



            function findFirstAstronaut(people) {
            for (let i = 0; i < people.length; i++) {
            if (people[i].isAstronaut) {
            return people[i];
            }
            }
            return null;
            }





            share|improve this answer


























              1














              You need to use the index for the array.




              people[i]                // for the object
              people[i].isAstronaut // for a property of the object



              Then you need only a check if isAstronaut is true and return with the item.



              At the end outside of the for loop, return null, for a not found astronaut.



              If you check inside the loop, you will return too early with the wrong result.



              function findFirstAstronaut(people) {
              for (let i = 0; i < people.length; i++) {
              if (people[i].isAstronaut) {
              return people[i];
              }
              }
              return null;
              }





              share|improve this answer
























                1












                1








                1






                You need to use the index for the array.




                people[i]                // for the object
                people[i].isAstronaut // for a property of the object



                Then you need only a check if isAstronaut is true and return with the item.



                At the end outside of the for loop, return null, for a not found astronaut.



                If you check inside the loop, you will return too early with the wrong result.



                function findFirstAstronaut(people) {
                for (let i = 0; i < people.length; i++) {
                if (people[i].isAstronaut) {
                return people[i];
                }
                }
                return null;
                }





                share|improve this answer












                You need to use the index for the array.




                people[i]                // for the object
                people[i].isAstronaut // for a property of the object



                Then you need only a check if isAstronaut is true and return with the item.



                At the end outside of the for loop, return null, for a not found astronaut.



                If you check inside the loop, you will return too early with the wrong result.



                function findFirstAstronaut(people) {
                for (let i = 0; i < people.length; i++) {
                if (people[i].isAstronaut) {
                return people[i];
                }
                }
                return null;
                }






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered 7 hours ago









                Nina Scholz

                174k1388152




                174k1388152

























                    5














                    ES6 introduces a new way to achieve this, if ES6 is an option for you:



                    myArray.find(item => {
                    return item.isAstronaut
                    })


                    Or even more abbreviated:



                    myArray.find(item => item.isAstronaut)


                    find() is a one of the new iterators, along with filter() and map() and others for more easily working with arrays. find() will return the first item in your array that matches the condition. The => or "arrow function" means that you do not need to explicitly include the return statement.



                    Read more about ES6 iterators.






                    share|improve this answer


























                      5














                      ES6 introduces a new way to achieve this, if ES6 is an option for you:



                      myArray.find(item => {
                      return item.isAstronaut
                      })


                      Or even more abbreviated:



                      myArray.find(item => item.isAstronaut)


                      find() is a one of the new iterators, along with filter() and map() and others for more easily working with arrays. find() will return the first item in your array that matches the condition. The => or "arrow function" means that you do not need to explicitly include the return statement.



                      Read more about ES6 iterators.






                      share|improve this answer
























                        5












                        5








                        5






                        ES6 introduces a new way to achieve this, if ES6 is an option for you:



                        myArray.find(item => {
                        return item.isAstronaut
                        })


                        Or even more abbreviated:



                        myArray.find(item => item.isAstronaut)


                        find() is a one of the new iterators, along with filter() and map() and others for more easily working with arrays. find() will return the first item in your array that matches the condition. The => or "arrow function" means that you do not need to explicitly include the return statement.



                        Read more about ES6 iterators.






                        share|improve this answer












                        ES6 introduces a new way to achieve this, if ES6 is an option for you:



                        myArray.find(item => {
                        return item.isAstronaut
                        })


                        Or even more abbreviated:



                        myArray.find(item => item.isAstronaut)


                        find() is a one of the new iterators, along with filter() and map() and others for more easily working with arrays. find() will return the first item in your array that matches the condition. The => or "arrow function" means that you do not need to explicitly include the return statement.



                        Read more about ES6 iterators.







                        share|improve this answer












                        share|improve this answer



                        share|improve this answer










                        answered 7 hours ago









                        Toby

                        4,96242146




                        4,96242146























                            0














                            You could simply filter out array elements that have an isAstronaut property equal to false using Array.prototype.filter. I prefer filter to Array.prototype.find since ES6 isn't supported in every browser.



                            Once you have the filtered array simply take the element in the 0 index position. Something like below:






                            const astronauts = [{
                            name: "Johnny Karate",
                            isAstronaut: false
                            },
                            {
                            name: "Neil Armstrong",
                            isAstronaut: true
                            },
                            {
                            name: "Valentina Tereshkova",
                            isAstronaut: true
                            },
                            {
                            name: "Bert Macklin",
                            isAstronaut: false
                            },
                            {
                            name: "Eileen Collins",
                            isAstronaut: true
                            },
                            {
                            name: "Kip Hackman",
                            isAstronaut: false
                            }
                            ];

                            //Array destructuring to get the first astronaut:
                            var [firstAstronautFound] = astronauts.filter(el => el.isAstronaut);

                            //Line above is same as doing this:
                            //var firstAstronautFound = astronauts.filter(el => el.isAstronaut)[0];

                            console.log(firstAstronautFound.name);








                            share|improve this answer


























                              0














                              You could simply filter out array elements that have an isAstronaut property equal to false using Array.prototype.filter. I prefer filter to Array.prototype.find since ES6 isn't supported in every browser.



                              Once you have the filtered array simply take the element in the 0 index position. Something like below:






                              const astronauts = [{
                              name: "Johnny Karate",
                              isAstronaut: false
                              },
                              {
                              name: "Neil Armstrong",
                              isAstronaut: true
                              },
                              {
                              name: "Valentina Tereshkova",
                              isAstronaut: true
                              },
                              {
                              name: "Bert Macklin",
                              isAstronaut: false
                              },
                              {
                              name: "Eileen Collins",
                              isAstronaut: true
                              },
                              {
                              name: "Kip Hackman",
                              isAstronaut: false
                              }
                              ];

                              //Array destructuring to get the first astronaut:
                              var [firstAstronautFound] = astronauts.filter(el => el.isAstronaut);

                              //Line above is same as doing this:
                              //var firstAstronautFound = astronauts.filter(el => el.isAstronaut)[0];

                              console.log(firstAstronautFound.name);








                              share|improve this answer
























                                0












                                0








                                0






                                You could simply filter out array elements that have an isAstronaut property equal to false using Array.prototype.filter. I prefer filter to Array.prototype.find since ES6 isn't supported in every browser.



                                Once you have the filtered array simply take the element in the 0 index position. Something like below:






                                const astronauts = [{
                                name: "Johnny Karate",
                                isAstronaut: false
                                },
                                {
                                name: "Neil Armstrong",
                                isAstronaut: true
                                },
                                {
                                name: "Valentina Tereshkova",
                                isAstronaut: true
                                },
                                {
                                name: "Bert Macklin",
                                isAstronaut: false
                                },
                                {
                                name: "Eileen Collins",
                                isAstronaut: true
                                },
                                {
                                name: "Kip Hackman",
                                isAstronaut: false
                                }
                                ];

                                //Array destructuring to get the first astronaut:
                                var [firstAstronautFound] = astronauts.filter(el => el.isAstronaut);

                                //Line above is same as doing this:
                                //var firstAstronautFound = astronauts.filter(el => el.isAstronaut)[0];

                                console.log(firstAstronautFound.name);








                                share|improve this answer












                                You could simply filter out array elements that have an isAstronaut property equal to false using Array.prototype.filter. I prefer filter to Array.prototype.find since ES6 isn't supported in every browser.



                                Once you have the filtered array simply take the element in the 0 index position. Something like below:






                                const astronauts = [{
                                name: "Johnny Karate",
                                isAstronaut: false
                                },
                                {
                                name: "Neil Armstrong",
                                isAstronaut: true
                                },
                                {
                                name: "Valentina Tereshkova",
                                isAstronaut: true
                                },
                                {
                                name: "Bert Macklin",
                                isAstronaut: false
                                },
                                {
                                name: "Eileen Collins",
                                isAstronaut: true
                                },
                                {
                                name: "Kip Hackman",
                                isAstronaut: false
                                }
                                ];

                                //Array destructuring to get the first astronaut:
                                var [firstAstronautFound] = astronauts.filter(el => el.isAstronaut);

                                //Line above is same as doing this:
                                //var firstAstronautFound = astronauts.filter(el => el.isAstronaut)[0];

                                console.log(firstAstronautFound.name);








                                const astronauts = [{
                                name: "Johnny Karate",
                                isAstronaut: false
                                },
                                {
                                name: "Neil Armstrong",
                                isAstronaut: true
                                },
                                {
                                name: "Valentina Tereshkova",
                                isAstronaut: true
                                },
                                {
                                name: "Bert Macklin",
                                isAstronaut: false
                                },
                                {
                                name: "Eileen Collins",
                                isAstronaut: true
                                },
                                {
                                name: "Kip Hackman",
                                isAstronaut: false
                                }
                                ];

                                //Array destructuring to get the first astronaut:
                                var [firstAstronautFound] = astronauts.filter(el => el.isAstronaut);

                                //Line above is same as doing this:
                                //var firstAstronautFound = astronauts.filter(el => el.isAstronaut)[0];

                                console.log(firstAstronautFound.name);





                                const astronauts = [{
                                name: "Johnny Karate",
                                isAstronaut: false
                                },
                                {
                                name: "Neil Armstrong",
                                isAstronaut: true
                                },
                                {
                                name: "Valentina Tereshkova",
                                isAstronaut: true
                                },
                                {
                                name: "Bert Macklin",
                                isAstronaut: false
                                },
                                {
                                name: "Eileen Collins",
                                isAstronaut: true
                                },
                                {
                                name: "Kip Hackman",
                                isAstronaut: false
                                }
                                ];

                                //Array destructuring to get the first astronaut:
                                var [firstAstronautFound] = astronauts.filter(el => el.isAstronaut);

                                //Line above is same as doing this:
                                //var firstAstronautFound = astronauts.filter(el => el.isAstronaut)[0];

                                console.log(firstAstronautFound.name);






                                share|improve this answer












                                share|improve this answer



                                share|improve this answer










                                answered 7 hours ago









                                tommyO

                                2,07911325




                                2,07911325























                                    0














                                    First, you may need to check whether there is any item in array or else return null.



                                    Second, you have to check for the property



                                    Third, you have to check for the value of the property isAstronaut



                                    function findFirstAstronaut(people) {
                                    if (people.length > 0)
                                    {
                                    for (let i = 0; i < people.length; i++) {
                                    if (("name" in people[i]) && ("isAstronaut" in people[i])) {
                                    if (people[i].isAstronaut)
                                    return people[i];
                                    else
                                    return true;
                                    }
                                    }
                                    }
                                    else
                                    return null;
                                    }





                                    share|improve this answer


























                                      0














                                      First, you may need to check whether there is any item in array or else return null.



                                      Second, you have to check for the property



                                      Third, you have to check for the value of the property isAstronaut



                                      function findFirstAstronaut(people) {
                                      if (people.length > 0)
                                      {
                                      for (let i = 0; i < people.length; i++) {
                                      if (("name" in people[i]) && ("isAstronaut" in people[i])) {
                                      if (people[i].isAstronaut)
                                      return people[i];
                                      else
                                      return true;
                                      }
                                      }
                                      }
                                      else
                                      return null;
                                      }





                                      share|improve this answer
























                                        0












                                        0








                                        0






                                        First, you may need to check whether there is any item in array or else return null.



                                        Second, you have to check for the property



                                        Third, you have to check for the value of the property isAstronaut



                                        function findFirstAstronaut(people) {
                                        if (people.length > 0)
                                        {
                                        for (let i = 0; i < people.length; i++) {
                                        if (("name" in people[i]) && ("isAstronaut" in people[i])) {
                                        if (people[i].isAstronaut)
                                        return people[i];
                                        else
                                        return true;
                                        }
                                        }
                                        }
                                        else
                                        return null;
                                        }





                                        share|improve this answer












                                        First, you may need to check whether there is any item in array or else return null.



                                        Second, you have to check for the property



                                        Third, you have to check for the value of the property isAstronaut



                                        function findFirstAstronaut(people) {
                                        if (people.length > 0)
                                        {
                                        for (let i = 0; i < people.length; i++) {
                                        if (("name" in people[i]) && ("isAstronaut" in people[i])) {
                                        if (people[i].isAstronaut)
                                        return people[i];
                                        else
                                        return true;
                                        }
                                        }
                                        }
                                        else
                                        return null;
                                        }






                                        share|improve this answer












                                        share|improve this answer



                                        share|improve this answer










                                        answered 7 hours ago









                                        Sonal Borkar

                                        35719




                                        35719























                                            0














                                            One liner



                                            arr.filter(item => item.isAstronaut)[0]





                                            share|improve this answer








                                            New contributor




                                            Ashay Mandwarya is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                                            Check out our Code of Conduct.























                                              0














                                              One liner



                                              arr.filter(item => item.isAstronaut)[0]





                                              share|improve this answer








                                              New contributor




                                              Ashay Mandwarya is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                                              Check out our Code of Conduct.





















                                                0












                                                0








                                                0






                                                One liner



                                                arr.filter(item => item.isAstronaut)[0]





                                                share|improve this answer








                                                New contributor




                                                Ashay Mandwarya is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                                                Check out our Code of Conduct.









                                                One liner



                                                arr.filter(item => item.isAstronaut)[0]






                                                share|improve this answer








                                                New contributor




                                                Ashay Mandwarya is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                                                Check out our Code of Conduct.









                                                share|improve this answer



                                                share|improve this answer






                                                New contributor




                                                Ashay Mandwarya is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                                                Check out our Code of Conduct.









                                                answered 6 hours ago









                                                Ashay Mandwarya

                                                515




                                                515




                                                New contributor




                                                Ashay Mandwarya is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                                                Check out our Code of Conduct.





                                                New contributor





                                                Ashay Mandwarya is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                                                Check out our Code of Conduct.






                                                Ashay Mandwarya is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                                                Check out our Code of Conduct.






















                                                    Georgia Lumley is a new contributor. Be nice, and check out our Code of Conduct.










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                                                    Georgia Lumley is a new contributor. Be nice, and check out our Code of Conduct.













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                                                    Georgia Lumley is a new contributor. Be nice, and check out our Code of Conduct.
















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