unshift Array Method | JavaScript Tutorial

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In this tutorial we're going to learn about the #unshift #JavaScript #Array Method and how it can be used to add one or more items at the beginning of an array. This method will also return the length of the new array.

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Can you explain why is it showing length of the array instead of whole new array in variable ?
Why is this useful, where can it be used...when we have .length property.

minnuss