Latest revision as of 12:38, 14 June 2015

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" );
}

Example of using the logical !? : operator:

println( $a == 100 !? "Value is NOT 100" : "The value is 100" );

The !? : operator is much faster than a full UNLESS statement so if you want more speed in your programs this is a rather good choice for simple Unless.

Can be used to set variables:

$var = $a == 100 !? "Value is NOT 100" : "The value is 100";

An IF can also be used by itself example

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

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

println("It is NOT 10") unless($a == 10);