43 lines
1.3 KiB
Markdown
43 lines
1.3 KiB
Markdown
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---
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title: Use the Rest Operator with Function Parameters
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---
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## Use the Rest Operator with Function Parameters
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### Rest parameter explanation
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[Mozilla Developer Network](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters "Mozilla Developer Network")
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### Spread operator compared to rest parameter
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[Stack overflow](https://stackoverflow.com/questions/33898512/spread-operator-vs-rest-parameter-in-es2015-es6 "Stack Overflow")
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### Video explaining spread and rest
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<a href="http://www.youtube.com/watch?feature=player_embedded&v=iLx4ma8ZqvQ
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" target="_blank"><img src="http://img.youtube.com/vi/iLx4ma8ZqvQ/0.jpg"
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alt="Image of youtube video link spread and rest operator " width="240" height="180" border="10" /></a>
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### Example
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This code
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```javascript
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const product = (function() {
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"use strict";
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return function product(n1, n2, n3) {
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const args = [n1, n2, n3];
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return args.reduce((a, b) => a * b, 1);
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};
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})();
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console.log(product(2, 4, 6));//48
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```
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Can be written as such
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```javascript
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const product = (function() {
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"use strict";
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return function product(...n) {
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return n.reduce((a, b) => a * b, 1);
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};
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})();
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console.log(product(2, 4, 6));//48
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```
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