Javascript function construct

Question

What does this construct mean?

var digits = [1, 2, 3];

(function fetchData(name){
 //body
})(digits.shift());

Chris Cherry · Accepted Answer · 2011-03-12 06:54:54Z

2

That syntax is used to prevent identifiers from leaking into the containing namespace.

After that code, if you attempt to call fetchData(name) you will find that fetchData is undefined, thanks to the () wrapper.

answered Mar 12, 2011 at 6:54

Chris Cherry

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Comments

arnorhs · Accepted Answer · 2011-03-12 06:53:02Z

2

which construct?

I can explain what's happening, if that will help:

(in the order of execution)

array gets created and assigned the name of "digits"
the first element of "digits" gets removed from the array - so the length of the array gets reduced
that value that got removed gets passed as an argument into the function fetchData() as the variable "name"

answered Mar 12, 2011 at 6:53

arnorhs

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Zimbabao · Accepted Answer · 2011-03-12 06:54:06Z

1

Declare a function and call it.

Click on this http://jsfiddle.net/TC8K6/ you will see a alert of the parameter passed to the function.

answered Mar 12, 2011 at 6:54

Zimbabao

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