Revision as of 04:13, 4 May 2012

Unless...Else Unless...Else

Description

Conditionally run statements.

Unless(<expression>)
{
    statements
    ...
}
Else If(expression-n)
{
    else if statements
    ...
}
Else Unless(expression-n)
{
    else if statements
    ...
}
Else
{
    else statements
    ...
}

Parameters

expression

If the expression is false, the first statement block is executed. If not, the first true Else If block is executed or the first false Else Unless block is executed. Otherwise, the "Else" block is executed.

All the Else If, Else Unless and Else blocks are optional.

Remarks

Unless statements may be nested.

Its worth noting you can use Else Ifs and Else Unless together with no problem.

The expression can contain the boolean operators of &&, ||, ! as well as the logical operators <, <=, >, >=, ==, !=, <>, eq, eqi, neq and neqi as needed grouped with parentheses as needed.

Example

Unless($a == 100)
{
	println( "Value is NOT 100" );
}
Else If($a == 200)
{
	println( "Value is 200" );
}
Else Unless($a == 44)
{
	println( "Value is NOT 44" );
}
Else
{
	println( "No Match" );
}

An IF can also be used by itself example

$a = 10;
unless($a == 10)
	println("It is 10");
 
// Or even
$a = 10;
unless($a == 10)
	println("It is 10");
else
	println("It is NOT 10");
 
// Or Even
$a = 10;
unless($a == 10)
	println("It is 10");
else unless($a == 11)
	println("It is 11");
else
	println("It is NOT 10");

On one line

$a = 10;
unless($a == 10) println("It is 10");
 
// Or even
$a = 10;
unless($a == 10) println("It is 10"); else println("It is NOT 10");
 
// Or even
$a = 10;
unless($a == 10) println("It is 10"); else unless($a == 11) println("It is 11"); else println("It is NOT 10");

This can also be done in reverse just for the IF itself example

println("It is 10") unless($a == 10);