Web Reference: Jul 12, 2025 · In JavaScript, slice () and splice () are array methods with distinct purposes. `slice ()` creates a new array containing selected elements from the original, while `splice ()` modifies the original array by adding, removing, or replacing elements. Syntax array.splice(start[, deleteCount[, item1[, item2[, ...]]]]) Parameters 1. start: required. Initial index. If start is negative it is treated as "Math.max((array.length + start), 0)" as per spec (example provided below) effectively from the end of array. 2. deleteCount: optional. Number of elements to be removed (all from startif not provided... Feb 14, 2026 · What is the main difference between slice and splice in JavaScript? The main difference is that slice () creates a new array with a portion of elements copied from the original array, while splice () mutates the original array itself by removing, replacing or adding elements to it.
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