HH\KeyedIterable::map

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

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.

Guide

• Examples

Parameters

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

Returns

• KeyedIterable<Tk,Tu> - a KeyedIterable containing the values after a user-specified operation is applied.