Call a local variable in some other function : Javascript

Question

I'd like to call a variable, lets say var cow; which is placed in the function function farm() in the function function milk().

<script type="text/javascript">
var cow
function farm() {

cow = Math.Random;

}

function milk(){

// call/return value of cow

}
</script>

Check out this link: GLOBAL VARIABLES IN JAVASCRIPT by Snook .
Now if you see the last code carefully, and test it...it actually doesn't work, but I want something similar to work. You can check the code below...

var myValue;
function setValue()
{
    myValue = "test";
}

function getValue()
{
    alert(window.myValue); // yup, it's "test" (original) ---> (after testing) No its "undefined"
}

And does your test work or not? What do you get if you test for the existence & value of the variable? Anything? Not sure based on your message whether you have a problem. If I ever have to do anything like that, I declare a GLOBAL variable outside of any functions, in the wide open, like so: var myValue; and then I simply keep referring to myValue in other functions. It works (but it's not recommended). — Shawn Spencer
– Shawn Spencer, Commented Dec 8, 2011 at 18:38
@ShawnSpencer : I get undefined...tried it many times...but still its "undefined" — Suraj
– Suraj, Commented Dec 8, 2011 at 18:40
@tunetosuraj - Your original statement is correct, cow will be global. However, you're probably looking for Math.random() and not Math.Random (which is undeclared and thus undefined).. See my answer for more details. — Mike Christensen
– Mike Christensen, Commented Dec 8, 2011 at 18:49
@MikeChristensen Thanks buddy.. I'm sorry I missed your answer.. — Suraj
– Suraj, Commented Dec 11, 2011 at 13:17

Irvin Dominin · Accepted Answer · 2011-12-08 18:46:06Z

2

Similar to your example you can declare cow in the global scope:

var cow;

function farm() {

  cow = Math.random();

}

function milk(){

  // call/return value of cow

}

here is a working fiddle http://jsfiddle.net/IrvinDominin/FTt5D/; pay attention random is a method, you must use parenthesis () and write it in lowercase.

edited Dec 8, 2011 at 18:46

answered Dec 8, 2011 at 18:38

Irvin Dominin

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1 Comment

Suraj Over a year ago

Dude you figured out what I was missing... :) well thanks a lot

Mike Christensen · Accepted Answer · 2011-12-08 18:44:53Z

2

What you have will actually work, as cow will be hoisted to the enclosing scope (which, in this case, is global). It might not work because the function is actually random(), not Random(), and it's a function not a variable - Try this:

function farm() {
   cow = Math.random();
}

function milk(){
   // call/return value of cow
   alert(cow);
}

farm(); //Init cow
milk(); //call milk

answered Dec 8, 2011 at 18:44

Mike Christensen

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Comments

Blender · Accepted Answer · 2011-12-08 18:35:53Z

0

Declare cow in the global scope:

var cow;

function farm() {
  cow = Math.Random;
}

function milk() {
  // call/return value of cow
}

But I'm now sure how this differs from your second example. Could you clarify your question?

answered Dec 8, 2011 at 18:35

Blender

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3 Comments

Suraj Over a year ago

Nope. done that already...doesn't work...Am I missing something?

Blender Over a year ago

You probably have more code. Can you post it? This code works just fine: jsfiddle.net/kLgwU/4

Suraj Over a year ago

In the second example, as it was stated on snook's site,...here window.somevariable is used...which is used to fetch a global variable...but that is not working for me

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