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В разделе
Переходим к нескольким аргументам с "func.apply"
после примера кода написано:Теперь он работает с любым количеством аргументов.
, ноhash
функция обрабатывала только два параметра, а не любое количество аргументов. Тем самым, потенциально, создавая неправильные ключи для кэша функций, принимающих больше двух параметров. Плюс, начиная с ES6 рекомендовано использовать "остаточные параметры" для получения массива аргументов.