functions.php ➔ curry() - Code Metrics - Inspection of "Merge pull request #3 from tarsana/speed" - tarsana/functional - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( d1fe82...d3deac )

by Amine

created 2017-01-05 16:45 UTC

functions.php ➔ curry() B

↳ Parent: Project

Complexity

Conditions	5
Paths	5

Size

Total Lines	10
Code Lines	8

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	5
eloc	8
nc	5
nop	1
dl	0
loc	10
rs	8.8571
c	0
b	0
f	0

<?php namespace Tarsana\Functional;

/**
 * Functions dealing with functions.
 * @file
 */

/**
 * Returns a curried equivalent of the provided function.
 *
 * ```php
 * $add = F\curry(function($x, $y) {
 *     return $x + $y;
 * });
 *
 * $add(1, 2); //=> 3
 * $addFive = $add(5); // this is a function
 * $addFive(1); //=> 6
 *
 * $data = [1, 2, 3, 4, 5];
 * $slice = F\curry('array_slice');
 * $itemsFrom = $slice($data);
 * $itemsFrom(2); //=> [3, 4, 5]
 * $itemsFrom(1, 2); //=> [2, 3, 4, 5]
 * // Notice that optional arguments are ignored !
 *
 * $polynomial = F\curry(function($a, $b, $c, $x) {
 *     return $a * $x * $x + $b * $x + $c;
 * });
 * $f = $polynomial(0, 2, 1); // 2 * $x + 1
 * $f(5); //=> 11
 * ```
 *
 * @signature (* -> a) -> (* -> a)
 * @param  callable $fn
 * @return callable
 */
function curry($fn) {
    $n = _number_of_args($fn);
    switch($n) {
        case 0: return $fn;
switch ($expr) {
case "A":
    doSomething(); //right
    break;
case "B":

    doSomethingElse(); //wrong
    break;
        case 1: return _curry_one($fn);
switch ($expr) {
case "A":
    doSomething(); //right
    break;
case "B":

    doSomethingElse(); //wrong
    break;
        case 2: return _curry_two($fn);
switch ($expr) {
case "A":
    doSomething(); //right
    break;
case "B":

    doSomethingElse(); //wrong
    break;
        case 3: return _curry_three($fn);
switch ($expr) {
case "A":
    doSomething(); //right
    break;
case "B":

    doSomethingElse(); //wrong
    break;
    }
    return _curry_n($fn, $n);
}

/**
 * Argument placeholder to use with curried functions.
 *
 * ```php
 * $reduce = F\curry('array_reduce');
 * $sum = $reduce(F\__(), F\plus());
 * $sum([1, 2, 3, 4], 0); //=> 10
 *
 * $polynomial = F\curry(function($a, $b, $c, $x) {
 *     return $a * $x * $x + $b * $x + $c;
 * });
 *
 * $multiplier = $polynomial(0, F\__(), 0, F\__());
 * $triple = $multiplier(3);
 * $triple(5); //=> 15
 * $multipleOfThree = $multiplier(F\__(), 3);
 * $multipleOfThree(4); //=> 12
 * ```
 *
 * @signature * -> Placeholder
 * @return Tarsana\Functional\Placeholder
 */
function __() {
    return Placeholder::get();
}

/**
 * Apply the provided function to the list of arguments.
 *
 * ```php
 * F\apply('strlen', ['Hello']); //=> 5
 * $replace = F\apply('str_replace');
 * $replace(['l', 'o', 'Hello']); //=> 'Heooo'
 * ```
 *
 * @signature (*... -> a) -> [*] -> a
 * @param  callable $fn
/**
 * @param array $germany
 * @param array $island
 * @param array $italy
 */
function finale($germany, $island) {
    return "2:1";
}
 * @param  array    $args
/**
 * @param array $germany
 * @param array $island
 * @param array $italy
 */
function finale($germany, $island) {
    return "2:1";
}
 * @return mixed
 */
function apply() {
    static $apply = false;
    $apply = $apply ?: curry(_f('_apply'));
    return _apply($apply, func_get_args());
}

/**
 * Performs left-to-right function composition.
 *
 * The leftmost function may have any arity;
 * the remaining functions must be unary.
 * The result of pipe is **not curried**.
 * **Calling pipe() without any argument returns the `identity` function**.
 *
 * ```php
 * $double = function($x) { return 2 * $x; };
 * $addThenDouble = F\pipe(F\plus(), $double);
 * $addThenDouble(2, 3); //=> 10
 * ```
 *
 * @signature (((a, b, ...) -> o), (o -> p), ..., (y -> z)) -> ((a, b, ...) -> z)
 * @param  callable $fns...
/**
 * @param array $germany
 * @param array $island
 * @param array $italy
 */
function finale($germany, $island) {
    return "2:1";
}
 * @return callable
 */
function pipe() {
    $fns = func_get_args();
    if(count($fns) < 1)
        return identity();
    return function () use ($fns) {
        $result = _apply(array_shift($fns), func_get_args());
        foreach ($fns as $fn) {
            $result = $fn($result);
        }
        return $result;
    };
}

/**
 * A function that takes one argument and
 * returns exactly the given argument.
 *
 * ```php
 * F\identity('Hello'); //=> 'Hello'
 * F\identity([1, 2, 3]); //=> [1, 2, 3]
 * F\identity(null); //=> null
 * ```
 *
 * @signature * -> *
 * @return mixed
 */
function identity() {
    static $identity = false;
    $identity = $identity ?: curry(function($value) {
        return $value;
    });
    return _apply($identity, func_get_args());
}

/**
 * Returns a function which whenever called will return the specified value.
 *
 * ```php
 * $five = F\give(5);
 * $five(); //=> 5
 * $null = F\give(null);
 * $null(); //=> null
 * ```
 *
 * @signature a -> (* -> a)
 * @param  mixed $value
/**
 * @param array $germany
 * @param array $island
 * @param array $italy
 */
function finale($germany, $island) {
    return "2:1";
}
 * @return callable
 */
function give() {
    static $give = false;
    $give = $give ?: curry(function($value) {
        return function() use($value) {
            return $value;
        };
    });
    return _apply($give, func_get_args());
}

/**
 * Takes many predicates and returns a new predicate that
 * returns `true` only if all predicates are satisfied.
 *
 * If no predicate is given as argument, this function
 * will return an always passing predicate.
 * ```php
 * $betweenOneAndTen = F\all(F\lt(1), F\gt(10));
 * $betweenOneAndTen(5); //=> true
 * $betweenOneAndTen(0); //=> false
 * $alwaysTrue = F\all();
 * $alwaysTrue(1); //=> true
 * $alwaysTrue(null); //=> true
 * ```
 *
 * @signature ((a -> Boolean), ..., (a -> Boolean)) -> (a -> Boolean)
 * @param  callable $predicates...
/**
 * @param array $germany
 * @param array $island
 * @param array $italy
 */
function finale($germany, $island) {
    return "2:1";
}
 * @return callable
 */
function all() {

    $predicates = func_get_args();
    return _curry_one(function($value) use(&$predicates) {
        foreach ($predicates as $predicate) {
            if (! $predicate($value))
                return false;
        }
        return true;
    });
}

/**
 * Takes many predicates and returns a new predicate that
 * returns `true` if any of the predicates is satisfied.
 *
 * If no predicate is given as argument, this function
 * will return an always non-passing predicate.
 * ```php
 * $startsOrEndsWith = function($text) {
 *     return F\any(F\startsWith($text), F\endsWith($text));
 * };
 * $test = $startsOrEndsWith('b');
 * $test('bar'); //=> true
 * $test('bob'); //=> true
 * $test('foo'); //=> false
 * $alwaysFlase = F\any();
 * $alwaysFlase(1); //=> false
 * $alwaysFlase(null); //=> false
 * ```
 *
 * @signature ((a -> Boolean), ..., (a -> Boolean)) -> (a -> Boolean)
 * @param  callable $predicates...
/**
 * @param array $germany
 * @param array $island
 * @param array $italy
 */
function finale($germany, $island) {
    return "2:1";
}
 * @return callable
 */
function any() {

    $predicates = func_get_args();
    return _curry_one(function($value) use(&$predicates) {
        foreach ($predicates as $predicate) {
            if ($predicate($value))
                return true;
        }
        return false;
    });
}

/**
 * Takes a function `f` and returns a function `g` so that if `f` returns
 * `x` for some arguments; `g` will return `! x` for the same arguments.
 *
 * Note that `complement($fn) == pipe($fn, not())`, So the resulting function is not curried !.
 * ```php
 * $isOdd = function($number) {
 *     return 1 == $number % 2;
 * };
 *
 * $isEven = F\complement($isOdd);
 *
 * $isEven(5); //=> false
 * $isEven(8); //=> true
 * ```
 *
 * @signature (* -> ... -> *) -> (* -> ... -> Boolean)
 * @param  callable $fn
/**
 * @param array $germany
 * @param array $island
 * @param array $italy
 */
function finale($germany, $island) {
    return "2:1";
}
 * @return callable
 */
function complement() {
    static $complement = false;
    $complement = $complement ?: curry(function($fn) {
        return function() use($fn) {
            return !_apply($fn, func_get_args());
        };
    });
    return _apply($complement, func_get_args());
}

/**
 * Takes a function telling if the first argument is less then the second, and return a compare function.
 *
 * A compare function returns `-1`, `0`, or `1` if the first argument is considered
 * to be respectively less than, equal to, or greater than the second.
 * ```php
 * $users = [
 *     ['name' => 'foo', 'age' => 21],
 *     ['name' => 'bar', 'age' => 11],
 *     ['name' => 'baz', 'age' => 15]
 * ];
 *
 * usort($users, F\comparator(function($a, $b){
 *     return $a['age'] < $b['age'];
 * }));
 *
 * F\map(F\get('name'), $users); //=> ['bar', 'baz', 'foo']
 * ```
 *
 * @signature (a -> a -> Boolean) -> (a -> a -> Number)
 * @param  callable $fn
/**
 * @param array $germany
 * @param array $island
 * @param array $italy
 */
function finale($germany, $island) {
    return "2:1";
}
 * @return callable
 */
function comparator() {
    static $comparator = false;
    $comparator = $comparator ?: curry(function($fn) {
        return function($a, $b) use($fn) {
            if ($fn($a, $b)) return -1;
            if ($fn($b, $a)) return 1;
            return 0;
        };
    });
    return _apply($comparator, func_get_args());
}


1		<?php namespace Tarsana\Functional;
2
3		/**
4		* Functions dealing with functions.
5		* @file
6		*/
7
8		/**
9		* Returns a curried equivalent of the provided function.
10		*
11		* ```php
12		* $add = F\curry(function($x, $y) {
13		* return $x + $y;
14		* });
15		*
16		* $add(1, 2); //=> 3
17		* $addFive = $add(5); // this is a function
18		* $addFive(1); //=> 6
19		*
20		* $data = [1, 2, 3, 4, 5];
21		* $slice = F\curry('array_slice');
22		* $itemsFrom = $slice($data);
23		* $itemsFrom(2); //=> [3, 4, 5]
24		* $itemsFrom(1, 2); //=> [2, 3, 4, 5]
25		* // Notice that optional arguments are ignored !
26		*
27		* $polynomial = F\curry(function($a, $b, $c, $x) {
28		* return $a * $x * $x + $b * $x + $c;
29		* });
30		* $f = $polynomial(0, 2, 1); // 2 * $x + 1
31		* $f(5); //=> 11
32		* ```
33		*
34		* @signature (* -> a) -> (* -> a)
35		* @param callable $fn
36		* @return callable
37		*/
38		function curry($fn) {
39		$n = _number_of_args($fn);
40		switch($n) {
41		case 0: return $fn;
		0 ignored issues – show Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report The case body in a switch statement must start on the line following the statement. According to the PSR-2, the body of a case statement must start on the line immediately following the case statement. switch ($expr) { case "A": doSomething(); //right break; case "B": doSomethingElse(); //wrong break; } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history... Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report Terminating statement must be on a line by itself As per the PSR-2 coding standard, the `break` (or other terminating) statement must be on a line of its own. switch ($expr) { case "A": doSomething(); break; //wrong case "B": doSomething(); break; //right case "C:": doSomething(); return true; //right } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history...
42		case 1: return _curry_one($fn);
		0 ignored issues – show Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report The case body in a switch statement must start on the line following the statement. According to the PSR-2, the body of a case statement must start on the line immediately following the case statement. switch ($expr) { case "A": doSomething(); //right break; case "B": doSomethingElse(); //wrong break; } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history... Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report Terminating statement must be on a line by itself As per the PSR-2 coding standard, the `break` (or other terminating) statement must be on a line of its own. switch ($expr) { case "A": doSomething(); break; //wrong case "B": doSomething(); break; //right case "C:": doSomething(); return true; //right } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history...
43		case 2: return _curry_two($fn);
		0 ignored issues – show Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report The case body in a switch statement must start on the line following the statement. According to the PSR-2, the body of a case statement must start on the line immediately following the case statement. switch ($expr) { case "A": doSomething(); //right break; case "B": doSomethingElse(); //wrong break; } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history... Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report Terminating statement must be on a line by itself As per the PSR-2 coding standard, the `break` (or other terminating) statement must be on a line of its own. switch ($expr) { case "A": doSomething(); break; //wrong case "B": doSomething(); break; //right case "C:": doSomething(); return true; //right } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history...
44		case 3: return _curry_three($fn);
		0 ignored issues – show Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report The case body in a switch statement must start on the line following the statement. According to the PSR-2, the body of a case statement must start on the line immediately following the case statement. switch ($expr) { case "A": doSomething(); //right break; case "B": doSomethingElse(); //wrong break; } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history... Coding Style introduced 2017-01-05 11:06 UTC by Report Bug Copy Issue Report Terminating statement must be on a line by itself As per the PSR-2 coding standard, the `break` (or other terminating) statement must be on a line of its own. switch ($expr) { case "A": doSomething(); break; //wrong case "B": doSomething(); break; //right case "C:": doSomething(); return true; //right } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history...
45		}
46		return _curry_n($fn, $n);
47		}
48
49		/**
50		* Argument placeholder to use with curried functions.
51		*
52		* ```php
53		* $reduce = F\curry('array_reduce');
54		* $sum = $reduce(F\__(), F\plus());
55		* $sum([1, 2, 3, 4], 0); //=> 10
56		*
57		* $polynomial = F\curry(function($a, $b, $c, $x) {
58		* return $a * $x * $x + $b * $x + $c;
59		* });
60		*
61		* $multiplier = $polynomial(0, F\__(), 0, F\__());
62		* $triple = $multiplier(3);
63		* $triple(5); //=> 15
64		* $multipleOfThree = $multiplier(F\__(), 3);
65		* $multipleOfThree(4); //=> 12
66		* ```
67		*
68		* @signature * -> Placeholder
69		* @return Tarsana\Functional\Placeholder
70		*/
71		function __() {
72		return Placeholder::get();
73		}
74
75		/**
76		* Apply the provided function to the list of arguments.
77		*
78		* ```php
79		* F\apply('strlen', ['Hello']); //=> 5
80		* $replace = F\apply('str_replace');
81		* $replace(['l', 'o', 'Hello']); //=> 'Heooo'
82		* ```
83		*
84		* @signature (... -> a) -> [] -> a
85		* @param callable $fn
		0 ignored issues – show Bug introduced 2017-01-05 13:55 UTC by Report Bug Copy Issue Report There is no parameter named `$fn`. Was it maybe removed? This check looks for PHPDoc comments describing methods or function parameters that do not exist on the corresponding method or function. Consider the following example. The parameter `$italy` is not defined by the method `finale(...)`. /** * @param array $germany * @param array $island * @param array $italy */ function finale($germany, $island) { return "2:1"; } The most likely cause is that the parameter was removed, but the annotation was not. Loading history...
86		* @param array $args
		0 ignored issues – show Bug introduced 2016-08-15 21:58 UTC by Report Bug Copy Issue Report There is no parameter named `$args`. Was it maybe removed? This check looks for PHPDoc comments describing methods or function parameters that do not exist on the corresponding method or function. Consider the following example. The parameter `$italy` is not defined by the method `finale(...)`. /** * @param array $germany * @param array $island * @param array $italy */ function finale($germany, $island) { return "2:1"; } The most likely cause is that the parameter was removed, but the annotation was not. Loading history...
87		* @return mixed
88		*/
89		function apply() {
90		static $apply = false;
91		$apply = $apply ?: curry(_f('_apply'));
92		return _apply($apply, func_get_args());
93		}
94
95		/**
96		* Performs left-to-right function composition.
97		*
98		* The leftmost function may have any arity;
99		* the remaining functions must be unary.
100		* The result of pipe is not curried.
101		* Calling pipe() without any argument returns the `identity` function.
102		*
103		* ```php
104		* $double = function($x) { return 2 * $x; };
105		* $addThenDouble = F\pipe(F\plus(), $double);
106		* $addThenDouble(2, 3); //=> 10
107		* ```
108		*
109		* @signature (((a, b, ...) -> o), (o -> p), ..., (y -> z)) -> ((a, b, ...) -> z)
110		* @param callable $fns...
		0 ignored issues – show Bug introduced 2016-11-16 15:09 UTC by Report Bug Copy Issue Report There is no parameter named `$fns...`. Was it maybe removed? This check looks for PHPDoc comments describing methods or function parameters that do not exist on the corresponding method or function. Consider the following example. The parameter `$italy` is not defined by the method `finale(...)`. /** * @param array $germany * @param array $island * @param array $italy */ function finale($germany, $island) { return "2:1"; } The most likely cause is that the parameter was removed, but the annotation was not. Loading history...
111		* @return callable
112		*/
113		function pipe() {
114		$fns = func_get_args();
115		if(count($fns) < 1)
116		return identity();
117		return function () use ($fns) {
118		$result = _apply(array_shift($fns), func_get_args());
119		foreach ($fns as $fn) {
120		$result = $fn($result);
121		}
122		return $result;
123		};
124		}
125
126		/**
127		* A function that takes one argument and
128		* returns exactly the given argument.
129		*
130		* ```php
131		* F\identity('Hello'); //=> 'Hello'
132		* F\identity([1, 2, 3]); //=> [1, 2, 3]
133		* F\identity(null); //=> null
134		* ```
135		*
136		* @signature * -> *
137		* @return mixed
138		*/
139		function identity() {
140		static $identity = false;
141		$identity = $identity ?: curry(function($value) {
142		return $value;
143		});
144		return _apply($identity, func_get_args());
145		}
146
147		/**
148		* Returns a function which whenever called will return the specified value.
149		*
150		* ```php
151		* $five = F\give(5);
152		* $five(); //=> 5
153		* $null = F\give(null);
154		* $null(); //=> null
155		* ```
156		*
157		* @signature a -> (* -> a)
158		* @param mixed $value
		0 ignored issues – show Bug introduced 2016-11-16 15:09 UTC by Report Bug Copy Issue Report There is no parameter named `$value`. Was it maybe removed? This check looks for PHPDoc comments describing methods or function parameters that do not exist on the corresponding method or function. Consider the following example. The parameter `$italy` is not defined by the method `finale(...)`. /** * @param array $germany * @param array $island * @param array $italy */ function finale($germany, $island) { return "2:1"; } The most likely cause is that the parameter was removed, but the annotation was not. Loading history...
159		* @return callable
160		*/
161		function give() {
162		static $give = false;
163		$give = $give ?: curry(function($value) {
164		return function() use($value) {
165		return $value;
166		};
167		});
168		return _apply($give, func_get_args());
169		}
170
171		/**
172		* Takes many predicates and returns a new predicate that
173		* returns `true` only if all predicates are satisfied.
174		*
175		* If no predicate is given as argument, this function
176		* will return an always passing predicate.
177		* ```php
178		* $betweenOneAndTen = F\all(F\lt(1), F\gt(10));
179		* $betweenOneAndTen(5); //=> true
180		* $betweenOneAndTen(0); //=> false
181		* $alwaysTrue = F\all();
182		* $alwaysTrue(1); //=> true
183		* $alwaysTrue(null); //=> true
184		* ```
185		*
186		* @signature ((a -> Boolean), ..., (a -> Boolean)) -> (a -> Boolean)
187		* @param callable $predicates...
		0 ignored issues – show Bug introduced 2016-12-21 00:21 UTC by Report Bug Copy Issue Report There is no parameter named `$predicates...`. Was it maybe removed? This check looks for PHPDoc comments describing methods or function parameters that do not exist on the corresponding method or function. Consider the following example. The parameter `$italy` is not defined by the method `finale(...)`. /** * @param array $germany * @param array $island * @param array $italy */ function finale($germany, $island) { return "2:1"; } The most likely cause is that the parameter was removed, but the annotation was not. Loading history...
188		* @return callable
189		*/
190	View Code Duplication	function all() {
		0 ignored issues – show Duplication introduced 2016-11-16 15:09 UTC by Report Bug Copy Issue Report This function seems to be duplicated in your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
191		$predicates = func_get_args();
192		return _curry_one(function($value) use(&$predicates) {
193		foreach ($predicates as $predicate) {
194		if (! $predicate($value))
195		return false;
196		}
197		return true;
198		});
199		}
200
201		/**
202		* Takes many predicates and returns a new predicate that
203		* returns `true` if any of the predicates is satisfied.
204		*
205		* If no predicate is given as argument, this function
206		* will return an always non-passing predicate.
207		* ```php
208		* $startsOrEndsWith = function($text) {
209		* return F\any(F\startsWith($text), F\endsWith($text));
210		* };
211		* $test = $startsOrEndsWith('b');
212		* $test('bar'); //=> true
213		* $test('bob'); //=> true
214		* $test('foo'); //=> false
215		* $alwaysFlase = F\any();
216		* $alwaysFlase(1); //=> false
217		* $alwaysFlase(null); //=> false
218		* ```
219		*
220		* @signature ((a -> Boolean), ..., (a -> Boolean)) -> (a -> Boolean)
221		* @param callable $predicates...
		0 ignored issues – show Bug introduced 2016-12-21 00:21 UTC by Report Bug Copy Issue Report There is no parameter named `$predicates...`. Was it maybe removed? This check looks for PHPDoc comments describing methods or function parameters that do not exist on the corresponding method or function. Consider the following example. The parameter `$italy` is not defined by the method `finale(...)`. /** * @param array $germany * @param array $island * @param array $italy */ function finale($germany, $island) { return "2:1"; } The most likely cause is that the parameter was removed, but the annotation was not. Loading history...
222		* @return callable
223		*/
224	View Code Duplication	function any() {
		0 ignored issues – show Duplication introduced 2016-11-16 15:09 UTC by Report Bug Copy Issue Report This function seems to be duplicated in your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
225		$predicates = func_get_args();
226		return _curry_one(function($value) use(&$predicates) {
227		foreach ($predicates as $predicate) {
228		if ($predicate($value))
229		return true;
230		}
231		return false;
232		});
233		}
234
235		/**
236		* Takes a function `f` and returns a function `g` so that if `f` returns
237		* `x` for some arguments; `g` will return `! x` for the same arguments.
238		*
239		* Note that `complement($fn) == pipe($fn, not())`, So the resulting function is not curried !.
240		* ```php
241		* $isOdd = function($number) {
242		* return 1 == $number % 2;
243		* };
244		*
245		* $isEven = F\complement($isOdd);
246		*
247		* $isEven(5); //=> false
248		* $isEven(8); //=> true
249		* ```
250		*
251		* @signature (* -> ... -> ) -> ( -> ... -> Boolean)
252		* @param callable $fn
		0 ignored issues – show Bug introduced 2017-01-05 13:55 UTC by Report Bug Copy Issue Report There is no parameter named `$fn`. Was it maybe removed? This check looks for PHPDoc comments describing methods or function parameters that do not exist on the corresponding method or function. Consider the following example. The parameter `$italy` is not defined by the method `finale(...)`. /** * @param array $germany * @param array $island * @param array $italy */ function finale($germany, $island) { return "2:1"; } The most likely cause is that the parameter was removed, but the annotation was not. Loading history...
253		* @return callable
254		*/
255		function complement() {
256		static $complement = false;
257		$complement = $complement ?: curry(function($fn) {
258		return function() use($fn) {
259		return !_apply($fn, func_get_args());
260		};
261		});
262		return _apply($complement, func_get_args());
263		}
264
265		/**
266		* Takes a function telling if the first argument is less then the second, and return a compare function.
267		*
268		* A compare function returns `-1`, `0`, or `1` if the first argument is considered
269		* to be respectively less than, equal to, or greater than the second.
270		* ```php
271		* $users = [
272		* ['name' => 'foo', 'age' => 21],
273		* ['name' => 'bar', 'age' => 11],
274		* ['name' => 'baz', 'age' => 15]
275		* ];
276		*
277		* usort($users, F\comparator(function($a, $b){
278		* return $a['age'] < $b['age'];
279		* }));
280		*
281		* F\map(F\get('name'), $users); //=> ['bar', 'baz', 'foo']
282		* ```
283		*
284		* @signature (a -> a -> Boolean) -> (a -> a -> Number)
285		* @param callable $fn
		0 ignored issues – show Bug introduced 2017-01-05 13:55 UTC by Report Bug Copy Issue Report There is no parameter named `$fn`. Was it maybe removed? This check looks for PHPDoc comments describing methods or function parameters that do not exist on the corresponding method or function. Consider the following example. The parameter `$italy` is not defined by the method `finale(...)`. /** * @param array $germany * @param array $island * @param array $italy */ function finale($germany, $island) { return "2:1"; } The most likely cause is that the parameter was removed, but the annotation was not. Loading history...
286		* @return callable
287		*/
288		function comparator() {
289		static $comparator = false;
290		$comparator = $comparator ?: curry(function($fn) {
291		return function($a, $b) use($fn) {
292		if ($fn($a, $b)) return -1;
293		if ($fn($b, $a)) return 1;
294		return 0;
295		};
296		});
297		return _apply($comparator, func_get_args());
298		}
299

tarsana / functional

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functions.php ➔ curry() B

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