Syntax: maxBy (comparer {(a, b) ==> diff})
Returns the maximum value in a sequence of values, using specified comparer.
Syntax: maxBy (comparer {(a, b) ==> diff}, selector {(v, k) ==> value})
Invokes a transform function on each element of a sequence and returns the maximum value, using specified comparer.
| public maxBy ( callable $comparer, callable | null $selector = null ) : number | ||
| $comparer | callable | {(a, b) ==> diff} Difference between a and b: <0 if a<b; 0 if a==b; >0 if a>b |
| $selector | callable | null | {(v, k) ==> value} A transform function to apply to each element. Default: value. |
| return | number | The maximum value in the sequence. |
public function maxBy($comparer, $selector = null)
{
$comparer = Utils::createLambda($comparer, 'a,b', Functions::$compareStrict);
$enum = $this;
if ($selector !== null) {
$enum = $enum->select($selector);
}
return $enum->aggregate(function ($a, $b) use($comparer) {
return $comparer($a, $b) > 0 ? $a : $b;
});
}