The article discusses the differences between the JavaScript methods map() and forEach(). While both are frequently used for iterating over arrays, map() is preferred for creating a new array based on transformed values. In contrast, forEach() executes a function on each item without returning a new array, making it suitable only for side-effect operations. The author highlights using map() to create arrays of transformed data and emphasizes avoiding side effects, ultimately suggesting that map() is more effective for data manipulation.
The map() method creates a new array by transforming each element of an existing array, while forEach() simply executes a function on each element without creating a new array.
Choosing map() over forEach() is essential when you need to create a transformed version of the data, as it preserves immutability of the original array.
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