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How to prepend a value to an array with JavaScript?

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To prepend a value to an array with JavaScript, we call the unshift method.

For instance, we write

a.slice().unshift(0);

to call a.slice to make copy of the a array.

And then we call unshift on the copied array to prepend 0 into the array.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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