DocumentationHSLReferenceFunctionHH\Lib\Vec\map_with_key

HH\Lib\Vec\map_with_key

Requires the Hack Standard Library to be installed.

Facebook Engineer?

This function is available as Vec\map_with_key() in Facebook's www repository.

Returns a new vec where each value is the result of calling the given function on the original key and value

namespace HH\Lib\Vec;

function map_with_key<Tk, Tv1, Tv2>(
  KeyedTraversable<Tk, Tv1> $traversable,
  (function(Tk, Tv1): Tv2) $value_func,
): vec<Tv2>;

Time complexity: O(n) Space complexity: O(n)

Parameters

KeyedTraversable<Tk, Tv1> $traversable
(function(Tk, Tv1): Tv2) $value_func

Returns

vec<Tv2>