Operators in JavaScript are very similar to the operators appearing in other programming languages. The definition of an operator is a symbol that is used to perform an operation. Very often these arithmetic operations (addition, subtraction, etc.), but not always.
JavaScript Arithmetic Operator Chart
| Operator | English | Example |
| + | Addition | 2+4 |
| - | Subtraction | 6-2 |
| * | Multiplication | 2*2 |
| / | Division | 15/3 |
| % | Modulas | 43%10 |
% Module may be a new venture for you, but is a special way of saying "find the rest." When run as a division 15 / 3 gets 5, exactly. However, if you get a 43/10 answer to one decimal, 4.3. 10 passes to 40 in five times and then there is a surplus. This is what is left over is returned by the operator module. 43% 10 would be 3.
How to 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 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 = ") var 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:two plus ten = 12 |
Comparison Operators
The comparisons are used to verify the relationship between variables and / or values. A single equal sign sets a value, while a double equals sign (= =) compares three values. Comparison operators are used inside conditional statements and evaluate to true or false. Will talk more about conditional statements in the upcoming lessons.
| Operator | English | Example | Result |
| = = | Equal To | x = = y | false |
| != | Not equal to | X!=y | true |
| < | Less then | X<y | true |
| > | Grater then | x>y | false |
| <= | Less Than or Equal To | x <= y | true |
| >= | Greater Than or Equal To | x >= y | false |
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