What are the differences between forEach and map in JavaScript?

What are the differences between forEach and map in JavaScript?

The main difference is that forEach executes a function on each element but doesn't return a new array, while map creates a new array with the results of calling a function on every element.

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

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

When should I use map instead of forEach?

Use map when you need to transform data and create a new array. Use forEach when you just want to perform an action on each element without needing a new array.

Are there any performance differences between them?

Generally, forEach may be slightly faster since it doesn't create a new array, but the difference is usually negligible unless you're working with large datasets.