array map
let numbers = [1, 2, 3, 4]
let filteredNumbers = numbers.map(function(_, 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]javascripr array.map
array.map( item => item.id )
array2.map( item => item.toString() )
array2.map( item => item * 3 )
// this will apply a transformation to all elements of an array
// "" item => something "" is the transformation (function)Copyright © 2021 Codeinu
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