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In javascript using forEach loop you can iterate on an array with index. You can check the following example where we are iterating on colors array with index.

var colors = ['red', 'green', 'blue'];

colors.forEach(function(v, i){
  console.log('Value at '+ i +' is: ' + v);
});

Output:

Value at 0 is: red
Value at 1 is: green
Value at 2 is: blue



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