forEach Method

forEach is an array method that runs a function for each item.

You pass the helper function in.

Think of a teacher handing every student the same worksheet.

Basic use

Call array.forEach(function).

Value and index

The callback can take the item and its index.

Arrow style

Many people write a short arrow function.

Good for side effects

forEach is nice when you want to print or update something.

It does not build a new array for you.

No easy break

You cannot use break inside forEach the same way as in a for loop.

If you need to stop early, a for or for...of loop is clearer.

map vs forEach

Use map when you want a new array of results.

Use forEach when you just want to do something with each item.

Tip: If you need a returned list, reach for map. If you only need actions, forEach is fine.