Declaring a boolean in JavaScript using just var

Question

If I declare a JavaScript boolean variable like this:

var IsLoggedIn;

And then initialize it with either true or 1

Answer 1

If you want IsLoggedIn to be treated as a boolean you should initialize as follows:

var IsLoggedIn=true;

If you initialize it with var IsLoggedIn=1; then it will be treated as an integer.

However at any time the variable IsLoggedIn could refer to a different data type:

 IsLoggedIn="Hello World";

This will not cause an error.