The Four Rules of This

I’m going to print these out, laminate them, and never worry about this again.

• Constructor binding - when the call site is a constructor call using the new keyword, this will refer to the new object created (see below notes on new keyword).
• Explicit binding - when the call site uses .call() or .bind(), this will refer to the object parameter passed.
• Implicit binding - when the call site is an object calling a reference to a property function, this will refer to the calling object.
• Default binding - when the call site is a function reference with no binding, this will refer to global scope if not in strict mode. In strict mode, this will be undefined.