krazov

var array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
var newArray = [];

for (var i = 0; i < array.length; i++) {
    newArray.push(array[i] * 2);
}

krazov

var array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
var newArray = [];

array.forEach(function (item) {
    newArray.push(item * 2);
});

krazov

const array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

const newArray = array.map(function (item) {
    return item * 2;
});

krazov

const array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

const newArray = array.map(item => item * 2);

krazov

var array    = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
var newArray = [];

for (var i = 0; i < array.length; i++) {
    if (array[i] % 2 == 0) {
        newArray.push(array[i] * 2);
    }
}

krazov

const array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

const newArray = array
  .filter(item => item % 2 == 0)
  .map(item => item * 2);

krazov

// the array
const array = [
    { value: 1 }, 
    { value: 2 }, 
    { value: 3 }, 
    { value: 4 }, 
    { value: 5 }, 
    { value: 6 }, 
    { value: 7 }, 
    { value: 8 }, 

krazov

const array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

var sum = array.reduce((result, value) => result + value);

krazov

const array = [1, 2, 2, 3, 4, 2, 5, 6, 7, 4, 8, 9, 10];

const distinctArray = array.reduce((final, current) => final.indexOf(current) > -1 ? final : final.concat(current), []);

krazov

// mocked stuff
const stringTemplate = 'I’m sorry, {astronautName}. I’m afraid I can’t do that. This mission is too important for me to allow you to {unwantedThing} it.';

const values = {
    astronautName: 'Dave',
    unwantedThing: 'jeopardize'
};

// original function
function parseTemplate(stringTemplate, values) {