Javascript Operators
Operators in Javascript are very similar to operators that appear in other
programming languages. The definition of an operator is a symbol
that is used to perform an operation. Most often these operations are arithmetic
(addition, subtraction, etc), but not always.
You will want to bookmark this page for future reference.
Javascript Arithmetic Operator Chart
| Operator | English | Example |
|---|
| + | Addition | 2 + 4 |
| - | Subtraction | 6 - 2 |
| * | Multiplication | 5 * 3 |
| / | Division | 15 / 3 |
| % | Modulus | 43 % 10 |
Javascript Operator Example with Variables
Performing operations on variables that contain values is very common and easy to do.
Below is a simple script that performs all the basic arithmetic operations.
HTML & JavaScript Code:
<body>
<script type="text/javascript">
<!--
var two = 2
var ten = 10
var linebreak = "<br />"
document.write("two plus ten = ")
result = two + ten
document.write(result)
document.write(linebreak)
document.write("ten * ten = ")
result = ten * ten
document.write(result)
document.write(linebreak)
document.write("ten / two = ")
result = ten / two
document.write(result)
//-->
</script>
</body>
Display:
Comparison Operators
Comparisons are used to check the relationship between variables and/or
values. A single equal sign sets a value while a double equal sign (==) compares two values. Comparison
operators are used inside conditional statements and evaluate to either true
or false.
| Operator | English | Example | Result |
|---|
| == | Equal To | x == y | false |
| != | Not Equal To | x != y | true |
| < | Less Than | x < y | true |
| > | Greater Than | x > y | false |
| <= | Less Than or Equal To | x <= y | true |
| >= | Greater Than or Equal To | x >= y | false |
| 
