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How does the Array.map() method work?

Asked on Jul 18, 2025

Answer

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The Array.map() method creates a new array populated with the results of calling a provided function on every element in the calling array.

<!-- BEGIN COPY / PASTE -->
        const numbers = [1, 2, 3, 4];
        const doubled = numbers.map(num => num * 2);
        console.log(doubled); // Output: [2, 4, 6, 8]
        <!-- END COPY / PASTE -->

Additional Comment:

The Array.map() method does not modify the original array; it returns a new array.
The provided function is called once for each element in the array.
The function can take up to three arguments: the current element, the index of the current element, and the array itself.
Array.map() is useful for transforming data in an array without mutating the original data.

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