Web Reference: In general you would use concat when you have two (or more) arrays from arbitrary sources, and you would use the spread syntax in the array literal if the additional elements that are always part of the array are known before. Jul 23, 2025 · To splice or remove elements without changing the original array, you can use various techniques to create a copy first. Here are the most effective ways to do this. 1. Using slice () and concat () Methods - Most Used. Master spread operator array concatenation for merging datasets, API responses, and pagination data elegantly.
YouTube Excerpt: Learn how to combine and copy
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