Web Reference: Jul 10, 2025 · The splice() method of Array instances changes the contents of an array by removing or replacing existing elements and/or adding new elements in place. To create a new array with a segment removed and/or replaced without mutating the original array, use toSpliced(). This tutorial covers beginner-friendly methods to replace parts of an array using splice(), direct index assignment, and map(). Each technique serves a unique purpose and works best depending on whether you're replacing one item, many items, or based on conditions. May 7, 2011 · To get every instance use Array.map(): Of course, that creates a new array. If you want to do it in place, use Array.forEach(): For anyone else reading this. Both map () and forEach () are newer additions to the Javascript spec and aren't present in some older browsers.
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