CODEWITHSUNDEEP
javascriptnode.jsbrowser
Denis Kotov
Denis Kotov

Reputation: 892

JavaScript Browser vs NodeJs compatibility

I cannot get why in Browser code like this:

var gLet = 5;
alert(window.gLet); // 5 (become a property of the window object)

even thought it is old behavior works differently in Node.js:

var gVar = 5;
console.log(global.gVar); // undefined (don't become a property of the global object)

But it works like this in Node.js:

gVar = 5;
console.log(global.gVar); // 5 (become a property of the global object)

This mean that Node.js do not completely support old behavior? Just try to figure out all of it ...

Upvotes: 3

Views: 2108

Answers (2)

Kevin G
Kevin G

Reputation: 1

Try this:

  (function myModule() {
      var gVar = 5;
      global.gVar = gVar;
      console.log(global.gVar);
    })();

Here you need to set first gVar in global object after that you can see the output gVar from global.

Upvotes: 0

Quentin
Quentin

Reputation: 944216

Each module has its own scope, so when you declare a variable with var inside a module, it is scoped there and not globally.

Implicit globals still work as normal. You should activate strict mode so you don't create them.

Upvotes: 3

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