How var Affects Variable Scope

We're almost done. Just one more piece to the puzzle.

Just as declaring a variable in a execution context (inside a function, so it is local, or outside all functions so it is global), the var keyword can also affect whether a variable is local or global.

If you use the var keyword, you are writing a var statement, such as var x = 10. Using a var statement declares that the variable should be local to the current execution context. Not using a var statement, however, declares that the variable should be global. So if you don't use var, no matter where you declare the varible, it will have a global scope.

Here's an example.