Array map function doesn't change elements

Question

In JavaScript, I have an array, which is

array = [true, false]

In some cases, I am trying to initialize this array

array.map(i         


        

Answer 1

.map() method is not mutable, check out its return value:

var arr2 = array.map(item => false)
console.log(arr2)

In functional programming, it's recommended that values do not change often, and JavaScript borrowed it. At least for .map() and .reduce() this is true. Make sure you know .map() well.