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JavaScript Array Iteration with a For Loop

Daniele Fusari
Daniele Fusari
40,669 Points
Posted by Daniele Fusari
Daniele Fusari
40,669 Points

.forEach loop

Just wondered how you would use the .forEach loop on this.

I get the for loop 

 for (let i=0; i < myRandomList.length; i++) {
  console.log('Item ' + i + ' in the array is ' + myRandomList[i]);
}

How do I get the forEach loop to go through each item in the array, dont have an i counter

myRandomList.forEach(function (){
  console.log('The number is ' + myRandomList.forEach() ); ???
});

1 Answer

Chris Shaw
Chris Shaw
26,676 Points
Chris Shaw
Chris Shaw
26,676 Points

Hi Daniele Fusari,

The forEach method supplies 3 parameters that we can make use of which are currentValue, index and array (meaning the current array). What this means is rather than needing to know the index we can simply access the current value in the iterator and we will get the same result as we do in your first example.

myRandomList.forEach(function(listItem, index) {
  console.log('Item ' + index + ' in the array is ' + listItem);
});

Pretty cool right?

You can read a heap more about forEach on MDN.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach

Happy coding!