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  Classes of Nathaniel Sherwood  >  Encase PHP Functional Programming  >  map.php  >  Download  
File: map.php
Role: Example script
Content type: text/plain
Description: Example script
Class: Encase PHP Functional Programming
Make functions work as if they are class functions
Author: By
Last change:
Date: 8 months ago
Size: 1,513 bytes
 

 

Contents

Class file image Download
<?php
namespace Encase\Functional;

/**
 * Copy `$iterable` and call `$func` once for each iteration of iterable,
 * replacing values in the returned copy with the value returned from each call
 * to `$func`.
 *
 * Passes the value, key and original `$iterable` to $func on each iteration.
 *
 * To preserve array or object keys, pass true to `$preserveKeys`.
 *
 * @param \Traversable|iterable|\stdClass|null $iterable
 * Array or object to iterate over.
 * @param callable|\Encase\Functional\Func|null
 * @param bool $preserveKeys
 * Set to true to preserve keys.
 * @return mixed New object or array with the same type as $iterable, or an
 * array if $iterable does not implement \ArrayAccess.
 */
function map($iterable, $func = null, bool $preserveKeys = false)
{
   
assertType($iterable, ['\Traversable', 'iterable', 'stdClass', 'null'], 'iterable');

    if (\
is_object($iterable)) {
        if (
$iterable instanceof \ArrayIterator) {
           
$output = new \ArrayObject($iterable->getArrayCopy());
        } elseif (
$iterable instanceof \ArrayAccess) {
           
$output = clone $iterable;
        } else {
           
$output = (array)$iterable;
        }
    } else {
       
$output = empty($iterable) || !$preserveKeys ? [] : $iterable;
    }

    if (!empty(
$iterable)) {
        foreach (
$iterable as $key => $value) {
           
$value = $func ? apply($value, $func, $key, $iterable) : $value;

            if (
$preserveKeys) {
               
$output[$key] = $value;
            } else {
                unset(
$output[$key]);
               
$output[] = $value;
            }
        }
    }

    return
$output;
}