The (++) and (--) operators are use to increment or decrement a variable by one.
Syntax 1
result = ++variable
result = --variable
result = variable++
result = variable--
Syntax 2
++variable
--variable
variable++
variable--
The syntax of the ++ and -- operators has these parts:
Part |
Description |
result |
Any variable. |
variable |
Any variable. |
Example
The increment and decrement operators are used as a shortcut to modify the value stored in a variable. The value of an expression containing one of these operators depends on whether the operator comes before or after the variable:
k = 2;
j = ++k;
document.write("K is: " + k + "and J is: " + j );
|
j is assigned the value 3, as the increment occurs before the expression is evaluated.
Contrast the following example:
k = 2;
j = k++;
document.write("K is: " + k + "and J is: " + j );
|
Here, j is assigned the value 2, as the increment occurs after the expression is evaluated.
See also: Operator Behavior, Operator Precedence, Operator Summary |
