swap element

const a = ['a', 'b', 'c', 'e', 'd'];
[a[3], a[4]] = [a[4], a[3]]; //[ 'a', 'b', 'c', 'd', 'e' ]

a=1, b=2;
[a, b]=[b, a];

Array push to append multiple values

array.push(element)

You can use a push() method to append more than one value to an array in a single call.

array.push(item1, item2, item3,...,itemN)