IsContainer::fold()

Completed

Pull Request — master (#76)

by Luke

created 2017-01-20 12:03 UTC

↳ Parent: IsContainer

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<?php
/**
 * Nozavroni/Collections
 * Just another collections library for PHP5.6+.
 * @version   {version}
 * @copyright Copyright (c) 2017 Luke Visinoni <[email protected]>
 * @author    Luke Visinoni <[email protected]>
 * @license   https://github.com/deni-zen/csvelte/blob/master/LICENSE The MIT License (MIT)
 */

namespace Noz\Traits;

trait IsContainer
{

    /**
     * Determine if this collection contains a value.
     *
     * Allows you to pass in a value or a callback function and optionally an index,
     * and tells you whether or not this collection contains that value.
     * If the $index param is specified, only that index will be looked under.
     *
     * @param mixed|callable $value The value to check for
     * @param mixed          $index The (optional) index to look under
     *
     * @return bool True if this collection contains $value
     *
     * @todo Maybe add $identical param for identical comparison (===)
     * @todo Allow negative offset for second param
     */
    public function contains($value, $index = null)
    {
        return (bool) $this->fold(function ($carry, $val, $key) use ($value, $index) {
            if ($carry) {
                return $carry;
            }
            if (is_callable($value)) {
                $found = $value($val, $key);
            } else {
                $found = ($value == $val);
            }
            if ($found) {
                if (is_null($index)) {
                    return true;
                }
                if (is_array($index)) {
                    return in_array($key, $index);
                }

                return $key == $index;
            }

            return false;
        });
    }

    abstract public function fold(callable $funk, $initial = null);

}

1			<?php
2			/**
3			* Nozavroni/Collections
4			* Just another collections library for PHP5.6+.
5			* @version {version}
6			* @copyright Copyright (c) 2017 Luke Visinoni <[email protected]>
7			* @author Luke Visinoni <[email protected]>
8			* @license https://github.com/deni-zen/csvelte/blob/master/LICENSE The MIT License (MIT)
9			*/
10
11			namespace Noz\Traits;
12
13			trait IsContainer
14			{
15
16			/**
17			* Determine if this collection contains a value.
18			*
19			* Allows you to pass in a value or a callback function and optionally an index,
20			* and tells you whether or not this collection contains that value.
21			* If the $index param is specified, only that index will be looked under.
22			*
23			* @param mixed\|callable $value The value to check for
24			* @param mixed $index The (optional) index to look under
25			*
26			* @return bool True if this collection contains $value
27			*
28			* @todo Maybe add $identical param for identical comparison (===)
29			* @todo Allow negative offset for second param
30			*/
31			public function contains($value, $index = null)
32			{
33			return (bool) $this->fold(function ($carry, $val, $key) use ($value, $index) {
34			if ($carry) {
35			return $carry;
36			}
37			if (is_callable($value)) {
38			$found = $value($val, $key);
39			} else {
40			$found = ($value == $val);
41			}
42			if ($found) {
43			if (is_null($index)) {
44			return true;
45			}
46			if (is_array($index)) {
47			return in_array($key, $index);
48			}
49
50			return $key == $index;
51			}
52
53			return false;
54			});
55			}
56
57			abstract public function fold(callable $funk, $initial = null);
58
59			}

nozavroni / collections

Pull Request — master (#76)

IsContainer::fold()

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