Question

If I declare a JavaScript boolean variable like this:

var IsLoggedIn; 

And then initialize it with either true or 1, is that safe? Or will initializing it with 1 make the variable a number?

Answer 1

Types are dependent to your initialization:

var IsLoggedIn1 = 'true'; //string var IsLoggedIn2 = 1; //integer var IsLoggedIn3 = true; //bool 

But take a look at this example:

var IsLoggedIn1 = 'true'; //string IsLoggedIn1 = true; //now your variable is a boolean 

Your variables’ type depends on the assigned value in JavaScript.