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Added rest destructuring (#18)

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Igor Timarac 2018-02-13 17:56:04 +01:00 committed by Yangshun Tay
parent d8da908263
commit 6110ed20de
1 changed files with 11 additions and 1 deletions
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@ -1674,7 +1674,7 @@ var person = {
var copyOfTodd = { ...person };
```
ES6's rest syntax offers a shorthand for including an arbitrary number of arguments to be passed to a function. It is like an inverse of the spread syntax, taking data and stuffing it into an array rather than upacking an array of data, but it only works in function arguments.
ES6's rest syntax offers a shorthand for including an arbitrary number of arguments to be passed to a function. It is like an inverse of the spread syntax, taking data and stuffing it into an array rather than upacking an array of data, and it works in function arguments, as well as in array and object destructuring assignments.
```js
function addFiveToABunchOfNumbers(...numbers) {
@ -1682,12 +1682,22 @@ function addFiveToABunchOfNumbers(...numbers) {
}
var result = addFiveToABunchOfNumbers(4, 5, 6, 7, 8, 9, 10); // [9, 10, 11, 12, 13, 14, 15]
var [a, b, ...rest] = [1, 2, 3, 4]; // a: 1, b: 2, rest: [3, 4]
var {a, b, ...rest} = {
a: 1,
b: 2,
c: 3,
d: 4
}; // a: 1, b:2, rest: { c: 3, d: 4 }
```
###### References
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment
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