Js Spread Rest — Free Javascript Tutorial

Learn Js Spread Rest in Javascript with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

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TL;DR: Learn Js Spread Rest in Javascript with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated Jul 14, 2026

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Js Spread Rest in Javascript

Spread `...` expands an iterable (array/string) into individual elements. Used in: function calls, array literals, object literals.

Rest `...` collects remaining elements into an array. Used in: function parameters, destructuring.

Copy array: `const copy = [...original]`. Merge arrays: `const merged = [...arr1, ...arr2]`.

Copy object: `const copy = {...original}`. Override: `const updated = {...user, age: 20}`.

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