We like to see at least an attempt when requesting for help.

You would use a loop to go through the array. You can use a counter and increase its value by 2 each iteration of the loop.

Now if you mean the contents of the array values being even then you can use the modulos operator % to check for evens.

Hit the submit key instead of preview....

I was going to add some stuff about grep and map but Aristotle already did that..