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polyfill an ES5-compatibile Object.keys where needed.
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| Object.keys = Object.keys || | |
| function ( | |
| o, // object | |
| k, // key | |
| r // result array | |
| ){ | |
| // initialize object and result | |
| r=[]; | |
| // iterate over object keys | |
| for (k in o) | |
| // fill result array with non-prototypical keys | |
| r.hasOwnProperty.call(o, k) && r.push(k); | |
| // return result | |
| return r | |
| } |
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| Object.keys=Object.keys||function(o,k,r){r=[];for(k in o)r.hasOwnProperty.call(o,k)&&r.push(k);return r} |
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| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| Version 2, December 2004 | |
| Copyright (C) 2011 Alex Kloss <[email protected]> | |
| Everyone is permitted to copy and distribute verbatim or modified | |
| copies of this license document, and changing it is allowed as long | |
| as the name is changed. | |
| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION | |
| 0. You just DO WHAT THE FUCK YOU WANT TO. |
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| { | |
| "name": "objkeys", | |
| "description": "polyfill an ES5-compatibile Object.keys where needed.", | |
| "keywords": [ | |
| "object", | |
| "keys", | |
| "es5", | |
| "polyfill" | |
| ] | |
| } |
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| <!DOCTYPE html> | |
| <title>Foo</title> | |
| <div>Expected value: <b>test, a, b, c</b></div> | |
| <div>Actual value: <b id="ret"></b></div> | |
| <script> | |
| var testdata = { test: 1, a: 2, b: 3, c: 4 }; | |
| var keys = Object.keys=Object.keys||function(o,k,r){r=[];for(k in o)r.hasOwnProperty.call(o,k)&&r.push(k);return r} | |
| document.getElementById( "ret" ).innerHTML = keys(testdata); | |
| </script> |
Sorry, got carried away by the Array stuff; hasOwnProperty is usually a prototypical method of Object, so setting it is usually a somewhat stupid idea (like naming an form input "action" or "submit". Anyway, one could use r.hasOwnProperty.call(o,k) to take care of this.
hey @atk, would you mind taking the trailing comma out of your package.json keywords?
Not at all (same for the other gists) :)
To be ES5 compatible it would also need to throw an error when o is not an object/function.
Object.keys=Object.keys||function(o,r){r=[];for(r[r.length] in o);return r}for(r[r.length] in o); - this is Beautiful! but we have to use hasOwnProperty...
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There is no
Object.prototype.keysin ES5 ;)/edit:
You code fails for:
{hasOwnProperty:3}