Conditions provide a simple but powerful way to control the flow of code execution. Loops allow you to perform repetitive operations with less code. Let's take a look at:
ifconditionsswitchstatementswhile,do-while,for, andfor-inloops
Note
The examples in the following sections require you to switch to the multiline Firebug console. Or, if you use the WebKit console, use Shift + Enter instead of Enter to add a new line.
Here's a simple example of an if condition:
var result = '', a = 3;
if (a > 2) {
result = 'a is greater than 2';
}The parts of the if condition are:
The
ifstatementA condition in parentheses—"is
agreater than 2?"A block of code wrapped in
{}that executes if the condition is satisfied
The condition (the part in parentheses) always returns a Boolean value, and may also contain the following:
A logical operation:
!,&&, or||A comparison, such as
===,!=,>, and so onAny value or variable that can be converted to a Boolean...