public function testFnRevComp()
{
$range = range(1, 100);
$rangeReverse = array_reverse($range);
// Check the values are sorted.
$result = $range;
usort($result, FnSort::fnRevComp(FnGen::fnIdentity()));
$this->assertEquals($rangeReverse, $result);
}
public function __construct($fnPrev = null)
{
if (!$fnPrev) {
$fnPrev = FnGen::fnIdentity();
}
$this->fnToApply = function ($values) use($fnPrev) {
return Sequence::make($fnPrev($values));
};
}
/**
* @param Iterator $iterator
* @param callable|null $fnMapValueFunction($value, $key)
* @param callable|null $fnMapKeyFunction($key, $value)
*/
public function __construct(Iterator $iterator, $fnMapValueFunction, $fnMapKeyFunction)
{
parent::__construct($iterator);
if (!$fnMapKeyFunction) {
$fnMapKeyFunction = FnGen::fnIdentity();
}
if (!$fnMapValueFunction) {
$fnMapValueFunction = FnGen::fnIdentity();
}
$this->fnMapValueFunction = $fnMapValueFunction;
$this->fnMapKeyFunction = $fnMapKeyFunction;
}
/**
* @param Iterator $iterator
* @return MappedSequence
*/
public static function sequenceNumericKeys(Iterator $iterator)
{
return new MappedSequence($iterator, FnGen::fnIdentity(), FnGen::fnIfMap(FnGen::fnIsNumeric(), FnGen::fnCounter(), FnGen::fnIdentity()));
}
/**
* Returns the key of the first element where $fnTest returns true.
*
* @param callable|null $fnTest($value, $key)
* @return mixed
*/
public function firstKey($fnTest = null)
{
$fnTest = $fnTest ?: fn\fnTrue();
return $this->filter($fnTest)->limit(1)->keys()->reduce(null, FnGen::fnSwapParamsPassThrough(FnGen::fnIdentity()));
}
public function testFnIdentity()
{
$fn = FnGen::fnIdentity();
$this->assertTrue($fn(99) === 99);
$this->assertTrue($fn("hello") === "hello");
}
