HH\KeyedIterable::map

Returns a KeyedIterable containing the values after an operation has been applied to each value in the current KeyedIterable

Description

public function map<Tu>(
  (function(Tv):Tu) $fn,
): KeyedIterable<Tk, Tu>;

Every value in the current KeyedIterable is affected by a call to map(), unlike filter() where only values that meet a certain criteria are affected.

Parameters

  • (function(Tv):Tu) $fn - The callback containing the operation to apply to the KeyedIterable values.

Return Values