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DocumentationHackReferenceClassHH\ImmMapat

HH\ImmMap::at

Returns the value at the specified key in the current ImmMap

public function at(
  Tk $key,
): Tv;

If the key is not present, an exception is thrown. If you don't want an exception to be thrown, use get() instead.

$v = $map->at($k) is semantically equivalent to $v = $map[$k].

Parameters

  • Tk $key

Returns

  • Tv - The value at the specified key; or an exception if the key does not exist.

Examples

See [Map::at](</hack/reference/class/Map/at/#examples>) for usage examples.