Web Reference: In that case, the function returns undefined, what you are seeing in the result. The map function is used to map one value to another, but it looks like you actually want to filter the array, which a map function is not suitable for. This almost always happens for one simple reason: the callback function passed to map() is not explicitly returning a value. This guide will explain the root cause of this problem, show you how to fix it, and clarify the important difference between using map() for transformations and using filter() for selections. Mar 4, 2024 · The map() method returns undefined values when we forget to explicitly return a value in the callback function we passed to the method. Make sure to return a value from the callback function to not get any undefined values in the array.
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