unable to pus multiple items into array code example

Example 1: how to add multiple elements to A new array javascript

let vegetables = ['parsnip', 'potato']
let moreVegs = ['celery', 'beetroot']

// Merge the second array into the first one
// Equivalent to vegetables.push('celery', 'beetroot')
Array.prototype.push.apply(vegetables, moreVegs)

console.log(vegetables)  // ['parsnip', 'potato', 'celery', 'beetroot']

Example 2: javascript add multiple items to array

var a = [];
    
a.push(1, 2, 3);

console.log(a);