https://github.com/zloirock/forof
Work with iterators from ES5 / ES3 syntax.
https://github.com/zloirock/forof
Last synced: 9 months ago
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Work with iterators from ES5 / ES3 syntax.
- Host: GitHub
- URL: https://github.com/zloirock/forof
- Owner: zloirock
- License: mit
- Created: 2015-06-14T12:25:08.000Z (over 10 years ago)
- Default Branch: master
- Last Pushed: 2019-10-30T01:22:58.000Z (about 6 years ago)
- Last Synced: 2025-04-09T09:52:39.670Z (9 months ago)
- Language: JavaScript
- Size: 9.77 KB
- Stars: 7
- Watchers: 3
- Forks: 2
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# forof
Work with iterators from ES5 / ES3 syntax. Equals of `for-of` loop and array / generator comprehensions. Extracted from [core-js](https://github.com/zloirock/core-js). Does not contains polyfills of collections and standard iterators, if you need it - use `core-js`.
**Deprecated in favor of usage iterator helpers proposal [implemented in `core-js`](https://github.com/zloirock/core-js#iterator-helpers).**
[development version](https://raw.githack.com/zloirock/forof/master/index.js), [production version](https://raw.githack.com/zloirock/forof/master/forof.min.js)
[](https://www.npmjs.org/package/forof/) [](https://travis-ci.org/zloirock/forof)
```javascript
$for(iterable, entries) -> iterator ($for)
#of(fn(value, key?), that) -> void
#array(mapFn(value, key?)?, that) -> array
#filter(fn(value, key?), that) -> iterator ($for)
#map(fn(value, key?), that) -> iterator ($for)
```
[Examples](http://goo.gl/Jtz0oG):
```javascript
var $for = require('forof'); // with a modular system, otherwise use global `$for`
$for(new Set([1, 2, 3, 2, 1])).of(function(it){
log(it); // => 1, 2, 3
});
$for([1, 2, 3].entries(), true).of(function(key, value){
log(key); // => 0, 1, 2
log(value); // => 1, 2, 3
});
$for('abc').of(console.log, console); // => 'a', 'b', 'c'
$for([1, 2, 3, 4, 5]).of(function(it){
log(it); // => 1, 2, 3
if(it == 3)return false;
});
var ar1 = $for([1, 2, 3]).array(function(v){
return v * v;
}); // => [1, 4, 9]
var set = new Set([1, 2, 3, 2, 1]);
var ar1 = $for(set).filter(function(v){
return v % 2;
}).array(function(v){
return v * v;
}); // => [1, 9]
var iter = $for(set).filter(function(v){
return v % 2;
}).map(function(v){
return v * v;
});
iter.next(); // => {value: 1, done: false}
iter.next(); // => {value: 9, done: false}
iter.next(); // => {value: undefined, done: true}
var map1 = new Map([['a', 1], ['b', 2], ['c', 3]]);
var map2 = new Map($for(map1, true).filter(function(k, v){
return v % 2;
}).map(function(k, v){
return [k + k, v * v];
})); // => Map {aa: 1, cc: 9}
```
## Changelog
##### 1.0.0 - 2015.06.14
* publish