Foreach As Key Value Loop
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(Created page with "= Foreach As Key Value = === Description === Loop based on an expression. <pre> foreach( <expression> as <key> => <value> ) { statements ... } </pre> === Parameters =...")
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(Created page with "= Foreach As Key Value = === Description === Loop based on an expression. <pre> foreach( <expression> as <key> => <value> ) { statements ... } </pre> === Parameters =...")
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Revision as of 13:01, 8 August 2014
Contents |
Foreach As Key Value
Description
Loop based on an expression.
foreach( <expression> as <key> => <value> )
{
statements
...
}
Parameters
expression
An expression needs to be an array for this loop to happen.
key
The variable to place the key in most common as a $variable.
value
The variable to place the value in most common as a $variable.
Remarks
For...As..Key..Value statements may be nested.
If you wish to edit an array as you loop through it check out Each( <array> ) command see its examples one of them should tell you how to do this.
Example
Here we cycle through binary data :
$var = array( "One" => 100, "Two" => 200, "Three" => 300 ); Foreach ($var as $key => $value) { println( "Key '$key' | Value '$value'" ); }
A reverse foreach
$var = array( "One" => 100, "Two" => 200, "Three" => 300 ); println( "Key '$key' | Value '$value'" ) Foreach ($var as $key => $value);
Example of using Yield here
my $array = array("One" => "The", "Two" => "cat", "Three" => "and", "Four" => "the", "Five" => "dog"); List ( $k, $v ) = Cat($array); say "Key is: $k, value is: $v"; List ( $k, $v ) = Cat($array); say "Key is: $k, value is: $v"; List ( $k, $v ) = Cat($array); say "Key is: $k, value is: $v"; List ( $k, $v ) = Cat($array); say "Key is: $k, value is: $v"; List ( $k, $v ) = Cat($array); say "Key is: $k, value is: $v"; Function Cat( &$array ) { foreach( $array as $key => $value) Yield return array($key, $value); } // Prints // Key is: One, value is: The // Key is: Two, value is: cat // Key is: Three, value is: and // Key is: Four, value is: the // Key is: Five, value is: dog // Yield is used to save the position in the array etc // then continue from that position the next time you // do a loop etc // So here it saves the position each time and gives // the next item in the array each time you call the // function
