Syntax: max ()
Returns the maximum value in a sequence of values.
Syntax: max (selector {(v, k) ==> value})
Invokes a transform function on each element of a sequence and returns the maximum value.
public function max($selector = null)
{
$selector = Utils::createLambda($selector, 'v,k', Functions::$value);
$max = -PHP_INT_MAX;
$assigned = false;
foreach ($this as $k => $v) {
$max = max($max, $selector($v, $k));
$assigned = true;
}
if (!$assigned) {
throw new \UnexpectedValueException(Errors::NO_ELEMENTS);
}
return $max;
}