array.fill mdn code example

Example 1: javascript fill array

const fill = new Array(5).fill(0)
console.log(fill) // [ 0,0,0,0,0]

Example 2: js array fill map

let filledArray = new Array(10)
    .fill(null)
    .map(()=> ({'hello':'goodbye'}))

// In this approach, we are creating an array with ten empty slots, 
// then filling those slots with the null value, 
// then creating a new array with unique objects. 
// Now when we change an object in the array, 
// we are only changing a specific object, not a reference to an object.

Example 3: array fill

new Array(5).fill('element')
// ["element", "element", "element", "element", "element"]

Example 4: array js fill

let filledArray = new Array(10).fill({'hello':'goodbye'});