how to edit a js object/function

Question

Hi i am using an api but i should make a patch for it

Songapi.prototype.goPlaySong=Songapi.prototype.goPlaySong.toString().replace('["universal","emi","warner"]) !== -1','false');

doesn't work also tried

Songapi.prototype.goPlaySong=Function(Songapi.prototype.goPlaySong.toString().replace('["universal","emi","warner"]) !== -1','false'));

or

Songapi.prototype.goPlaySong=eval(Songapi.prototype.goPlaySong.toString().replace('["universal","emi","warner"]) !== -1','false'));

still couldn't do it any idea?

I'm not sure you can edit functions just like that. You could maybe store their code into a string, replace, and then eval the string, and finally set it as the function. — Virus721
– Virus721, Commented Jul 15, 2013 at 15:29
He wants to replace a test in a parsed function by an hard coded false boolean. — Virus721
– Virus721, Commented Jul 15, 2013 at 15:30
It seems to me you don't even understand what you are doing. You cannot just replace something there — vladkras
– vladkras, Commented Jul 15, 2013 at 15:33

flavian · Accepted Answer · 2013-07-15 15:35:17Z

3

DEMO

SongApi is a constructor a.k.a a class.

function inherits(child, parent) {
  function temp() {};
  temp.prototype = parent.prototype;
  child.prototype = new temp();
  child.prototype.constructor = child;
};

var CustomizedApi = function() {
    SongApi.call(this);
};
inherits(CustomizedApi, Songapi);
// or use Object.create for inheritance.
CustomizedApi.prototype = Object.create(SongApi.prototype);

/**
 * @override
 */
CustomizedApi.prototype.goPlaySong = function() {
   // override with whatever you want.
};
var api = new CustomizedApi;
api.goPlaySong();

edited Jul 15, 2013 at 15:35

answered Jul 15, 2013 at 15:33

flavian

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Virus721 · Accepted Answer · 2013-07-15 15:32:06Z

1

Try :

eval('var code = ' + Songapi.prototype.goPlaySong.toString().replace('["universal","emi","warner"]) !== -1','false'));

Songapi.prototype.goPlaySong = code;

But this is absolute dirtiness.

answered Jul 15, 2013 at 15:32

Virus721

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Comments

user2061745 · Accepted Answer · 2013-07-15 15:36:45Z

0

var newgoPlaySong=Songapi.prototype.goPlaySong.toString().replace('$.inArray(response.provider,["universal","emi","warner"]) !== -1','false');
eval('Songapi.prototype.goPlaySong = '+gecicigoPlaySong+';');

it worked thanks

answered Jul 15, 2013 at 15:36

user2061745

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