How to Use the Spread Operator (…) in JavaScript
The spread operator is a useful and quick syntax for adding items to arrays, combining arrays or objects, and spreading an array out into a function’s arguments.
Published in
6 min readOct 4, 2019
What is the spread operator?
In JavaScript, spread syntax refers to the use of an ellipsis of three dots (…) to expand an iterable object into the list of arguments.
“When
...arris used in the function call, it ‘expands’ an iterable objectarrinto the list of arguments.” — JavaScript.info
The spread operator was added to JavaScript in ES6 (ES2015), just like the rest parameters, which have the same syntax: three magic dots ….
What is ... used for?
“Spread operator to the rescue! It looks similar to rest parameters, also using
..., but does quite the opposite.” — JavaScript.info
