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DocumentationHackReferenceInterfaceMutableSetmap

MutableSet::map

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

public function map<Tu as arraykey>(
  (function(Tv): Tu) $fn,
): MutableSet<Tu>;

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

Guide

Parameters

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

Returns