ForcefulDarkkhakiPostscript created by jsmayo - https://repl.it/@jsmayo/ForcefulDarkkhakiPostscript

ForcefulDarkkhakiPostscript.js

/*
Write a function called doubleValues which accepts an array and returns a new array with all the values in the array passed to the function doubled

Examples:
    doubleValues([1,2,3]) // [2,4,6]
    doubleValues([1,-2,-3]) // [2,-4,-6]
*/

function doubleValues(arr){
    return arr.map(function(val, i, arr) {
        return val * 2;
    });
}
console.log(doubleValues([1,2,3]));
/*
Write a function called valTimesIndex which accepts an array and returns a new array with each value multiplied by the index it is currently at in the array.

Examples:
    valTimesIndex([1,2,3]) // [0,2,6]
    valTimesIndex([1,-2,-3]) // [0,-2,-6]
*/

function valTimesIndex(arr){
    return arr.map(function(val, i, arr) {
        return val * i;
    });
}
console.log(valTimesIndex([1,2,3]));
/*
Write a function called extractKey which accepts an array of objects and some key and returns a new array with the value of that key in each object.

Examples:
    extractKey([{name: 'Elie'}, {name: 'Tim'}, {name: 'Matt'}, {name: 'Colt'}], 'name') // ['Elie', 'Tim', 'Matt', 'Colt']
*/

function extractKey(arr, key){
    return arr.map(function(val, i, arr){
        return val[key];
    });
}
console.log(extractKey([{name: 'Elie'}, {name: 'Tim'}, {name: 'Matt'}, {name: 'Colt'}], 'name'));
/*
Write a function called extractFullName which accepts an array of objects and returns a new array with the value of the key with a name of "first" and the value of a key with the name of  "last" in each object, concatenated together with a space. 

Examples:
    extractFullName([{first: 'Elie', last:"Schoppik"}, {first: 'Tim', last:"Garcia"}, {first: 'Matt', last:"Lane"}, {first: 'Colt', last:"Steele"}]) // ['Elie Schoppik', 'Tim Garcia', 'Matt Lane', 'Colt Steele']
*/

function extractFullName(arr){
  return arr.map(function(val, i, arr) {
    return val.first + ' ' + val.last;
    });
}
console.log(extractFullName([{first: 'Elie', last:"Schoppik"}, {first: 'Tim', last:"Garcia"}, {first: 'Matt', last:"Lane"}, {first: 'Colt', last:"Steele"}]));