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JavaScriptBeginner#arrays
JavaScriptBeginner#arrays
Difference between forEach and map?
forEach runs a callback for side effects and returns undefined, so it cannot be chained. map returns a new array of results and should not be used purely for side effects.
Example
const out = [1,2].forEach(x => x*2); // undefined const arr = [1,2].map(x => x*2); // [2,4]