map function in javascript mdn code example
Example 1: array map javascript
const array1 = [1, 4, 9, 16];
// pass a function to map
const map1 = array1.map(x => x * 2);
console.log(map1);
// expected output: Array [2, 8, 18, 32]
Example 2: array mdn map
let new_array = arr.map(function callback( currentValue[, index[, array]]) {
// return element for new_array
}[, thisArg])
Example 3: array map
let numbers = [1, 4, 9]
let roots = numbers.map(function(num) {
return Math.sqrt(num)
})
// roots is now [1, 2, 3]
// numbers is still [1, 4, 9]