<?php use kim\present\utils\arrays\ArrayUtils;
$arrayUtils = ArrayUtils::from(["Apple" => 0, "Banana" => 1, "Carrot" => 2]);
//Gets first key
$arrayUtils->keyFirst();
// expected output: "Apple"
$arrayUtils->keyFirst() : int|string|null;
ArrayUtils::keyFirstFrom(iterable $from) : int|string|null;