Created
April 13, 2016 23:26
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import { Pipe } from 'angular2/core.js'; | |
/** | |
* Map to Iteratble Pipe | |
* | |
* It accepts Objects and [Maps](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map) | |
* | |
* Example: | |
* | |
* <div *ngFor="#keyValuePair of someObject | mapToIterable"> | |
* key {{keyValuePair.key}} and value {{keyValuePair.value}} | |
* </div> | |
* | |
*/ | |
@Pipe({ name: 'mapToIterable' }) | |
export class MapToIterable { | |
transform(value) { | |
let result = []; | |
if(value.entries) { | |
for (var [key, value] of value.entries()) { | |
result.push({ key, value }); | |
} | |
} else { | |
for(let key in value) { | |
result.push({ key, value: value[key] }); | |
} | |
} | |
return result; | |
} | |
} |
The Pipe
should be defined as impure with pure: false
because iterables like Map
doesn't change reference when using their methods. Be careful with large iterables though.
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Updated version for angular 2 rc4 that works in ES5: