global variable in javascript

Question

Good day!

I am writing a script as follows:

var prev = 0; $(document).ready(function(){ dynamicListOne(length, prev); }); function dynamicListOne(length, prev){ length++; prev = length; }

But prev is always 0. How can i assign prev=length?

Thank you in advance

Judging from this snippet (which has errors), the prev in function is not the same prev as the global. You passed a copy of it. — wkl
– wkl, Commented Dec 2, 2011 at 3:24
A function statement without a name is a syntax error. How have you actually defined it? — user1114
– user1114, Commented Dec 2, 2011 at 3:24

Matti Virkkunen · Accepted Answer · 2011-12-02 03:24:55Z

Your function takes prev as an argument so inside the function the name points to a local variable instead of the global one. Just don't add it as an argument to your function.

And think carefully if you really really want a global variable.

gahooa · Accepted Answer · 2011-12-02 03:25:27Z

The prev variable in your function signature hides the global prev variable. Choose a different name and it will work :)

Pastor Bones · Accepted Answer · 2011-12-02 03:29:06Z

There is no need to pass in prev as a parameter

var prev = 0; $(document).ready(function(){ dynamicListOne(length); console.log(prev) }); function(length){ length++; prev = length; }

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