ListOps: Use more expressive variable names

Author: homersimpsons

exercises/practice/list-ops/ListOps.php

@@ -37,7 +37,7 @@ public function concat(array $list1, array ...$listn): array
     }
 
     /**
-     * @param callable(mixed $el): bool $predicate
+     * @param callable(mixed $item): bool $predicate
      */
     public function filter(callable $predicate, array $list): array
     {
@@ -50,23 +50,23 @@ public function length(array $list): int
     }
 
     /**
-     * @param callable(mixed $el): mixed $function
+     * @param callable(mixed $item): mixed $function
      */
     public function map(callable $function, array $list): array
     {
         throw new \BadMethodCallException("Implement the map function");
     }
 
     /**
-     * @param callable(mixed $acc, mixed $el): mixed $function
+     * @param callable(mixed $accumulator, mixed $item): mixed $function
      */
     public function foldl(callable $function, array $list, $accumulator)
     {
         throw new \BadMethodCallException("Implement the foldl function");
     }
 
     /**
-     * @param callable(mixed $acc, mixed $el): mixed $function
+     * @param callable(mixed $accumulator, mixed $item): mixed $function
      */
     public function foldr(callable $function, array $list, $accumulator)
     {