/**
* Get the value of the provided key.
*
* @param string $key
*
* @return Maybe
*/
public function lookup($key)
{
if (!$this->member($key)) {
return Maybe::nothing();
}
return Maybe::just($this->value->offsetGet($key));
}
/**
* Get the value of the provided key.
*
* @param string $key
*
* @return Maybe
* @throws CoreException
*/
public function lookup($key)
{
foreach ($this->value as $innerKey => $value) {
if ($key === $innerKey) {
return Maybe::just($value);
}
}
return Maybe::nothing();
}
/**
* Get the value of the provided key.
*
* @param string $key
*
* @return Maybe
* @throws CoreException
*/
public function lookup($key)
{
Arguments::define($this->getKeyType())->check($key);
if (!$this->member($key)) {
return Maybe::nothing();
}
return Maybe::just($this->value[$key]);
}
/**
* @param callable $predicate
*
* @return Maybe
*/
public function find(callable $predicate)
{
$result = Maybe::nothing();
$this->each(function ($value, $key) use($predicate, &$result) {
if ($predicate($value, $key, $this)) {
$result = Maybe::just($value);
return false;
}
return true;
});
return $result;
}
/**
* @param mixed $key
*
* @return Maybe
*/
public function lookup($key)
{
if ($this->member($key) === false) {
return Maybe::nothing();
}
$copy = array_merge($this->value);
return Maybe::just($copy[$key]);
}
public function testFmap()
{
$just = Maybe::just('DOGE');
$nothing = Maybe::nothing();
$lowerCase = function ($string) {
return Maybe::just(strtolower($string));
};
$result1 = $just->fmap($lowerCase);
$result2 = $nothing->fmap($lowerCase);
$this->assertTrue($result1->isJust());
$this->assertTrue($result2->isNothing());
}
