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Currying: Difference between revisions
Better PHP example
(Add PHP) |
(Better PHP example) |
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Line 1,325:
<lang php><?php
function
{
return _make_function($
}
if (_number_of_required_params($callable) === 1) {
return _curry_array_args($callable, _rest(func_get_args()));
}
return _curry_array_args($callable, _rest(func_get_args()));
}
function _curry_array_args($callable, $args, $left = true)
{
return function () use ($callable, $args, $left) {
if (_is_fullfilled($callable, $args)) {
return _execute($callable, $args, $left);
}
$newArgs = array_merge($args, func_get_args());
if (_is_fullfilled($callable, $newArgs)) {
return _execute($callable, $newArgs, $left);
}
return _curry_array_args($callable, $newArgs, $left);
};
}
function _number_of_required_params($callable)
echo json_encode(array_map(product_curryied(7), [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]));</lang>▼
{
if (is_array($callable)) {
$refl = new \ReflectionClass($callable[0]);
$method = $refl->getMethod($callable[1]);
return $method->getNumberOfRequiredParameters();
}
$refl = new \ReflectionFunction($callable);
return $refl->getNumberOfRequiredParameters();
}
function _make_function($callable)
{
if (is_array($callable))
return function() use($callable) {
return call_user_func_array($callable, func_get_args());
};
return $callable;
}
function _execute($callable, $args, $left)
{
if (! $left) {
$args = array_reverse($args);
}
$placeholders = _placeholder_positions($args);
if (0 < count($placeholders)) {
$n = _number_of_required_params($callable);
if ($n <= _last($placeholders[count($placeholders) - 1])) {
throw new \Exception('Argument Placeholder found on unexpected position!');
}
foreach ($placeholders as $i) {
$args[$i] = $args[$n];
array_splice($args, $n, 1);
}
}
return call_user_func_array($callable, $args);
}
function _placeholder_positions($args)
{
return array_keys(array_filter($args, '_is_placeholder'));
}
function _is_fullfilled($callable, $args)
{
$args = array_filter($args, function($arg) {
return ! _is_placeholder($arg);
});
return count($args) >= _number_of_required_params($callable);
}
function _is_placeholder($arg)
{
return $arg instanceof Placeholder;
}
function _rest(array $args)
{
return array_slice($args, 1);
}
function product($a, $b)
{
return $a * $b;
}
▲echo json_encode(array_map(
{{out}}<pre>[7,14,21,28,35,42,49,56,63,70]</pre>
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