TypeScript Array.prototype.copyWithin() Method Last Updated : 28 Apr, 2025 Comments Improve Suggest changes Like Article Like Report The copyWithin() method is available in the TypeScript Array.prototype it helps you to rearrange the elements within the array by copying a sequence of array elements. This method is good for tasks such as shifting elements, removing them without creating gaps, or copying portions of arrays. Syntaxarray.copyWithin(target, start, end)Parameters:target: It contains the index position from which the copying of elements will start. start (optional): It contains the index position of the first element to copy (defaults to 0). end (optional): It contains the index position of the last element to copy (excluding it) (defaults to the array's length). Return Value:This method returns the same array instance (not a new array), allowing for chaining. Example 1: The below example is the basic implementation of copyWithin() method with two parameters. JavaScript const geeks: string[] = ['GFG', 'JavaScript', 'GFG', 'TypeScript']; // Copying the element at 3rd position and // store it at position 1 geeks.copyWithin(1, 3); console.log(geeks); Output: ["GFG", "TypeScript", "GFG", "TypeScript"]Example 2: The below code implements the copyWithin() method with three parameters. JavaScript const geeks: string[] = ['JavaScript', 'TypeScript', 'GeeksforGeeks', 'GFG']; // Copying the elements stored between position // 1(inclusive) and 3(exclusive) and then store // them at position 2 geeks.copyWithin(2, 1, 3); console.log(geeks); Output: ["JavaScript", "TypeScript", "TypeScript", "GeeksforGeeks"] Comment More infoAdvertise with us Next Article TypeScript Array.prototype.copyWithin() Method pankajbind Follow Improve Article Tags : JavaScript Web Technologies TypeScript Similar Reads TypeScript Array.prototype.at() Method The Array.prototype.at() method in TypeScript allows you to access elements in an array using both positive and negative indices. 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