Learn how `` works by learning how to write it yourself. We'll see what makes this function so powerful and how it allows us to work efficiently with large amounts of data. You'll use this functions thousands of times in your JavaScript career.

Learn how works by writing it yourself.

This function allows us to manipulate data effectively and efficiently. It’s meant to copy an array and change it a little bit in the process. You’ll be using it for the rest of your JavaScript career.

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