Difference between .forEach and .map

forEach

• Iterates through the elements in an array
• Executes a callback for each element.
• Does not return a value

map

• Iterates through the elements in an array

• “Maps” each element to a new element by calling the function on each element, creating a new array as a result.

• The main difference is that .map() returns a new array while .forEach does not (returns undefined)

• If you simply need to iterate over an array, forEach is a fine choice

• If you need the result but do not wish to mutate the original array, .map() is the clear choice.