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map elements of an array then make an action
let numbers = [1, 2, 3, 4]
let filteredNumbers = numbers.map(function(num, index) {
if (index < 3) {
return num
}
})
// index goes from 0, so the filterNumbers are 1,2,3 and undefined.
// filteredNumbers is [1, 2, 3, undefined]
// numbers is still [1, 2, 3, 4]
Source: developer.mozilla.org
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