For Loop
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println("Value $i"); // Yes the $_ gets set just like in Perl | println("Value $i"); // Yes the $_ gets set just like in Perl | ||
} | } | ||
| + | |||
| + | // A Reverse style | ||
| + | my $x = 5; | ||
| + | println("Hello $_") for(3..$x); | ||
</syntaxhighlight> | </syntaxhighlight> | ||
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println("Value $i"); // Yes the $_ gets set just like in Perl | println("Value $i"); // Yes the $_ gets set just like in Perl | ||
} | } | ||
| + | |||
| + | // A Reverse style | ||
| + | println("Hello $k") for(3..$x as $k); | ||
</syntaxhighlight> | </syntaxhighlight> | ||
[[Category:Core Function]] | [[Category:Core Function]] | ||
Revision as of 12:07, 9 August 2013
Contents |
For As
Description
Loop based on an expression.
for ( <expression1> ; <expression2> ; <expression3> )
{
statements
...
}
Parameters
expression1
An expression to execute before starting the loop.
expression2
An expression to evaulate and check if its TRUE.
If it is not TRUE the loop will end (Or not even begin).
expression3
An expression to execute after each cycle of the loop.
Usually $i++ or $i += something
Remarks
For statements may be nested.
The expression2 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
Count up to from 1 to 10
for ( $i = 1; $i <= 10; $i++ ) { println( "Value is $i" ); }
Count down to from 10 to 1
for ( $i = 10; $i > 0; $i-- ) { println( "Value is $i" ); }
Count up to from 2 to 20 counting in 2s
for ( $i = 2; $i <= 20; $i += 2 ) { println( "Value is $i" ); }
Print all array elements Method 1
$arr = array( "One", "Two", "Three", "Four", "Five" ); for ( $i = 0; $i < UBound($arr); $i++ ) { $item = $arr[$i]; println( "Value is " . $item ); }
Print all array elements Method 2
$arr = array( "One", "Two", "Three", "Four", "Five" ); for ( $i = 0; $i < UBound($arr); $i++ ) { println( "Value is $arr[$i]" ); }
A perl style number to number for
for( 0 .. 10 ) { println("Value $_"); // Yes the $_ gets set just like in Perl } // or for( 0 .. 10 as $i ) { println("Value $i"); // Yes the $_ gets set just like in Perl } // A Reverse style my $x = 5; println("Hello $_") for(3..$x);
Another perl style but this time using variables
$a = 1; $b = 30; for( $a..$b ) { println("Value $_"); // Yes the $_ gets set just like in Perl } // or for( $a..$b as $i ) { println("Value $i"); // Yes the $_ gets set just like in Perl } // A Reverse style println("Hello $k") for(3..$x as $k);
