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How to copy array items into another array with JavaScript?

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To copy array items into another array with JavaScript, we use the concat function.

For instance, we write

const arrayA = [1, 2];
const arrayB = [3, 4];
const newArray = arrayA.concat(arrayB);

to call arrayA.concat with arrayB to return a new array with arrayA‘s contents with arrayB‘s contents being it.

By John Au-Yeung

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

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