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JavaScript

Posted by robinbehroozi
robinbehroozi
15,912 Points

A Simple Javascript Question...

There is a challenge question at the end of the Variables section in Javascript Foundations…It's a simple question but I'm not sure I understand it. Here's the code…

var color = "red";

function example () {
  var color = "blue";
}

example()

alert(color);

so, what I think is happening is that there are 2 variables called color being created, one outside the function, and one inside the function. The one outside the function is holding the value "red and the one inside the function is holding the value "blue". But what I don't get is what the Alert is doing? I'm guessing an Alert screen is popping up with the value of color, but which one is it taking? I thought it would be taking "red" because it can't access "blue" but I think I'm wrong. Could someone explain?

1 Answer

Sreng Hong
Sreng Hong
15,083 Points
Sreng Hong
Sreng Hong
15,083 Points

Hi Robin, I tested on my console already. The right answer is "red".

The variable that declared on the first line is a global variable and the other is a local variable, so there aren't related. It's two different variables.

I think you might confused with the other question that look like this:

var color = "red";

function example () {
  color = "blue";
}

example()

alert(color);

So this one is different, because the variable that declared in the function didn't use var key word. It will modify the global one. The answer should be output "blue".

If you need more help, please tell me.

robinbehroozi
robinbehroozi
15,912 Points

Thank you Sreng for the explanation … it really helps!