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

350k87 gold badges811 silver badges683 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

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

149k145 gold badges502 silver badges833 bronze badges

Collectives™ on Stack Overflow

jQuery function source code

2 Answers 2

Comments

Comments

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Related