jQuery function source code

Question

jQuery 1.4.2 in IE 8

When I call $.isFunction(function() {}) it returns true.
Source code isFunction function:

    isFunction: function (obj) {
        return toString.call(obj) === "[object Function]";
    },

When I write in console toString.call(function() {}) === "[object Function]" it throws "Object doesn't support this property or method".

Source code of minified version:

isFunction:function(a){return $.call(a)==="[object Function]"}

When I write in console $.call(function() {})==="[object Function]" it returns false.
Why code works in different ways?

What are you actually asking here?

Alex
– Alex

2011-10-14 09:26:51 +00:00
Commented Oct 14, 2011 at 9:26 — Alex
– Alex, Commented Oct 14, 2011 at 9:26

Rob W · Accepted Answer · 2011-10-14 09:39:32Z

1

At the top of the JQuery 1.4.2 source (inside the wrapper), toString is defined as Object.prototype.toString. The global toString function is different from the prototyped toString method, hencethe different results.

// Save a reference to some core methods
toString = Object.prototype.toString,

answered Oct 14, 2011 at 9:39

Rob W

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Royi Namir · Accepted Answer · 2011-10-14 09:27:31Z

1

this is the truth :

 alert(   Object.prototype.toString.apply(t)    );

answered Oct 14, 2011 at 9:27

Royi Namir

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