HH\ImmMap::map

Returns an ImmMap after an operation has been applied to each value in the current ImmMap.

Description

public function map(
  callable $callback,
): ImmMap<Tk,Tu>

Returns an ImmMap after an operation has been applied to each value in the current ImmMap.

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

The keys will remain unchanged from this ImmMap to the returned ImmMap.

Parameters

  • callable $callback - The callback containing the operation to apply to the current ImmMap values.

Return Values

  • ImmMap<Tk,Tu> - an ImmMap containing key/value pairs after a user-specified operation is applied.

Examples

See Map::map for usage examples.