Difference between function declarations

Question

Possible Duplicate:
JavaScript: var functionName = function() {} vs function functionName() {}
What’s the difference in those declarations (in JavaScript)?

Is there any differences between the following function declarations:

function wtf() {

}

lol = function() {

}

omg: function() {

}

?

Regards

Please refer to this thread : http://stackoverflow.com/questions/1866084/javascript-function-declaration — amrfaissal, Dec 12 '12 at 14:11

score 4 · Answer 1 · edited May 23 '17 at 11:48

4

1st one :

creates a function at page level ( global level u can say )

2nd : Assings the function to variable 'lol'

3rd: Syntax error. :P

Exactly similar to: What's the difference in those declarations (in JavaScript)?

edited May 23 '17 at 11:48

Community

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answered Dec 12 '12 at 14:10

LPD

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The first one isn't necessarily global, it depends which scope it's defined in. Actually, in the example given, the second one is global, assuming the variable isn't scoped before. – deceze Dec 12 '12 at 14:12
@deceze: If first 2 declared inside a function: are not they exact equivalent? – closure Dec 12 '12 at 14:18
@raghavv this link explains it a bit more clearly. – LPD Dec 12 '12 at 14:27
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@raghavv Nope, try it: http://jsfiddle.net/UtTGG/ – deceze Dec 12 '12 at 14:29
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@raghavv, http://javascriptweblog.wordpress.com/2010/07/06/function-declarations-vs-function-expressions/ – LPD Dec 13 '12 at 04:21
@LPD thank you for the links and effort. It was very helpful. – closure Dec 13 '12 at 05:37

score 4 · Accepted Answer · answered Dec 12 '12 at 14:14

4

1- Is a regular function declaration.

2- You declare an anonymous function and you store it in a variable.

3- The last one is part of an object notation :

var obj = {
  omg:function(value){
    // some code here
  }
};

answered Dec 12 '12 at 14:14

amrfaissal

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score 0 · Answer 3 · answered Dec 12 '12 at 14:09

0

No, it’s the quite the same thing for each of them.

answered Dec 12 '12 at 14:09

phaazon

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Difference between function declarations

3 Answers3