When should I use forEach or map in JavaScript?

Can you explain when to use forEach or map in JavaScript?

Sure! Use forEach when you want to execute a function for each element without returning a new array. Use map when you want to transform each element and create a new array.

What’s the main difference between the two?

The main difference is that forEach does not return anything, while map returns a new array with the results of calling a function on every element.

Can you give me an example of each?

Of course! For forEach: array.forEach(item => console.log(item)); and for map: const newArray = array.map(item => item * 2);.

Are there any performance differences?

Generally, map can be slightly slower due to creating a new array, but the difference is usually negligible for small arrays.