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JS Spread Operator

This lesson is part of How To · All levels

Summary

The spread operator is a three-point (...) syntax in JavaScript that opens the contents of an array or object into separate parts. This operator is very useful for copying data, combining multiple arrays, and creating new objects without changing the original object. Because the copy is shallow, you need to be careful if it contains objects or clusters.

Key points

Written with three dots (...) in front of an array, object, or value that can be iterated
Can be used to make a superficial copy of arrays and objects
Facilitate the integration of arrays or the addition of new properties to an object
In function naming, the spread converts the array into a list of arguments
The copy is shallow, so the reference to the object in it is the same.

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