JavaScript What is a global variable in JavaScript? what global variable is,what is global variable in c,

I'm from a C# Class(), fields, properties, namespace...world. And I just launched myself into javascript. So far I've been doing great. However one of my friends was looking at my code and asked me why I did this.

function Position (x, y) {
    this.X = x;
    this.Y = y; 
}

friend: "You've just over-rided Position..." me : "What Position?" friend: "Could be anything the browser is using." me : "I am only running this script - it works perfectly" friend: "Until it doesn't work."

Ok so... What? Turns out Position is Global .. but where and to what extent? My friend makes it sound like its Global to the entire browser. So my question is;

Is a javascript Global, Global to the Entire Browser? > The Window Only? > The Tab Only?? > how far does it go??

Answer:1

It is global to the current window. Don't worry about other tabs, windows or iframes. That being said what I think he is trying to state is a good principle in JavaScript namely

Don't clutter up the global namespace

meaning that whatever you make global should not be much and it should be very intentional.

JavaScript has function scope (not block scope) and so an easy way to get around this is by wrapping everything in an immediately invoked function expression.

;(function () {

     function Position (x, y){
          this.X = x;
          this.Y = y;
     }

     // use Position here

}());
Answer:2

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