keyword « Var « Javascript Data Type Q&A

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Javascript Data Type Q&A » Var » keyword

1. Javascript - "let" keyword vs "var" keyword stackoverflow.com

In javascript 1.7, the let keyword was added. I've heard it described as a "local" variable, but I'm still not quite sure how it behaves differently than the var ...

2. Difference between using var and not using var in JavaScript stackoverflow.com

What exactly is the function of the var keyword in Javascript, and what is the difference between:

var someNumber = 2;
var someFunction = function() { doSomething; }
var someObject = { }
var someObject.someProperty ...

3. Confusing operation of JavaScript `var` keyword stackoverflow.com

I’ve run into a very strange (to me) problem with the var keyword. I’ve reduced it to a fairly minimal test case, and found it’s exhibited in Node.js (thus, V8 and ...

4. What is the advantage of initializing multiple javascript variables with the same var keyword? stackoverflow.com

When I read javascript code that is clean and written by people who are obviously very good at it, I often see this pattern

var x = some.initialization.method(),
    y ...

5. difference between var keyword and without var stackoverflow.com

Possible Duplicate:
Difference between using var and not using var in JavaScript

What is the difference between using var keyword in java script & without using ...

6. Declare variable without var keyword and logical OR stackoverflow.com

I get a strange behavior when declaring an object with the logical OR.

my_var = my_var || {}; // throws TypeError

If I add the var keyword

var my_var = my_var || {}; // ...

7. Why are arguments in JavaScript not preceded by the var keyword? stackoverflow.com

This may be a silly question, but why are function arguments in JavaScript not preceded by the var keyword? Why:

function fooAnything(anything) {
  return 'foo' + anyThing;
}

And not:

function fooAnything(var anything) {
  ...