how to change the size of an array code example

Example 1: array length javascript

var arr = [10,20,30,40,50]; //An Array is defined with 5 instances

var len= arr.length;  //Now arr.length returns 5.Basically, len=5.
console.log(len); //gives 5
console.log(arr.length); //also gives 5

Example 2: javascript size array

let array = [1, 2, 3];
console.log(array.length);