JavaScript Operators include these following items as below:

• Assignment Operators assign a value for variable
• Arithmetic Operators are used to arithmetic in number: addition, subtraction, multiplication, division, modulus, increment, decrement.
• Comparison Operators is quite simple to understand. Important note is the difference of == & ===; != & !==.
• Logical Operators: And/Or/Not

In general, the preference of Operators is simply presented from high to low as below:

1. ()
2. ++x
3. *; /
4. +; –
5. >;  <; >=; <=
6. x++

If operators have same preference, we will do from left to right.