Web Reference: Description The unshift() method adds new elements to the beginning of an array. The unshift() method overwrites the original array. The unshift() method of Array instances adds the specified elements to the beginning of an array and returns the new length of the array. Jul 31, 2025 · So, the next time you use shift() or unshift(), remember: JavaScript is quietly doing a lot of heavy lifting to maintain the order of your array. Understanding this can help you make better performance decisions, especially when working with large arrays or performance-critical code.
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