// Array :- It is collection more the single value inside an variable // fill():- fills elements of the given array with the specified static values. // arr.fill(value,start, end) // value - The static value to be filled. // start - It is optional. It represents the index from where the value starts filling. By default, it is 0. // end - It is optional. It represents the index where the value stops filling. By default, it is length-1. const arr1=[1,2,3,4,5]; const arr1Copy = arr1.fill("m",1,4)//it will fill the "m" from start index to end index console.log(arr1);// and this method modify the original array console.log(arr1Copy);