Can you explain when to use forEach vs 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 happens if I use map but don't return anything?
If you use map without returning a value, the new array will be filled with 'undefined' for each element.
Can you give me an example of both?
Of course! For forEach: array.forEach(item => console.log(item));
For map: const newArray = array.map(item => item * 2);
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Are there performance differences between them?
Yes, forEach is generally faster for simple iterations, while map is optimized for creating new arrays.
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