JavaScript Operators

Arithmetic Operators (given y = 5)

Operator Description Example Result
+ Addition x = y + 2 x = 7 y = 5
- Subtraction x = y - 2 x = 3 y = 5
* Multiplication x = y * 2 x = 10 y = 5
/ Division x = y / 2 x = 2.5 y = 5
% Modulus (division remainder) x = y % 2 x = 1 y = 5
++ Increment x = ++y x = 6 y = 6
x = y++ x = 5 y = 6
-- Decrement x = --y x = 4 y = 4
x = y-- x = 5 y = 4

Assignment Operators (given x = 10 and y = 5)

Operator Example Same as Result
= x = y   x = 5
+= x += y x = x + y x = 15
-= x -= y x = x - y x = 5
*= x *= y x = x * y x = 50
/= x /= y x = x / y x = 2
%= x %= y x = x % y x = 0

String Operator
The + operator can also be used to add string variables or text values together. If you add a number and a string, the result will be a string. For example, 
  5 + 5     = 10
  "5" + "5" = "55"
  "5" + 5   = "55"



   



Demonstration
The following demonstration shows how the script of HTML and JavaScript is displayed on the Web.

     





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