How to access array in circular manner in JavaScript

Question

I have an array like [A,B,C,D]. I want to access that array within a for loop like as

var arr = [A,B,C,D];

var len = arr.len;
for(var i = 0;i&         


        

Answer 1

Simply using modulus operator you can access array in circular manner.

var arr = ['A', 'B', 'C', 'D'];

for (var i = 0, len = arr.length; i < len; i++) {
  for (var j = 0; j < 3; j++) {
    console.log(arr[(i + j) % len])
  }
  console.log('****')
}