Javascript Reference - How to use Javascript array forEach function








forEach() accepts two arguments.

  • a function to run on each item and
  • an optional scope object

forEach() runs the given function on every item in the array. forEach() has no return value.

The function passed in receives three arguments.

  • the array item value,
  • the position of the item in the array
  • the array object itself.

It is the same as iterating over an array with a for loop.





Example


var numbers = [1,2,3,4,5,4,3,2,1]; 
        
numbers.forEach(function(item, index, array){ 
   console.log(item);
});

The code above generates the following result.

forEach() does not change the values contained in the array.