What is the purpose of the array forEach method in JavaScript?

What is the purpose of the array forEach method in JavaScript?

The forEach method executes a provided function once for each array element. It's useful for iterating over arrays.

Can you give me an example of how to use forEach?

Sure! Here's a simple example:

const numbers = [1, 2, 3, 4];
numbers.forEach(num => {
  console.log(num * 2);
});

This will log 2, 4, 6, and 8 to the console.

What are the differences between forEach and a regular for loop?

The forEach method is more concise and easier to read, but it can't be broken out of like a traditional for loop. Also, forEach doesn't return a value.

Are there any performance considerations when using forEach?

Yes, forEach can be slower than a traditional for loop for large arrays, as it involves function calls for each element. For performance-critical code, consider using a regular for loop.