763 B
763 B
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Map Function |
The Map Function
The map()
function is used for creating a new array from an existing one, applying a function to each one of the elements of the first array.
The original syntax of the map function is:
let new_arr = arr.map(function callback(currentValue, index, array) {
// Do some stuff with currentValue (index and array are optionals)
})
Example (ES6):
const myArray_1 = [1, 2, 3, 4];
const myArray_2 = myArray_1.map(el => el * 2);
myArray_2
will contain the elements: [2, 4, 6, 8]
map()
is a method of the Array
object, so to pass that function to an iterable object it is necessary to make the object an Array.