HH\Lib\Dict\from_keys
Requires the Hack Standard Library to be installed.
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This function is available as Dict\from_keys() in Facebook's www repository.
Returns a new dict where each value is the result of calling the given function on the corresponding key
namespace HH\Lib\Dict;
function from_keys<Tk as arraykey, Tv>(
Traversable<Tk> $keys,
(function(Tk): Tv) $value_func,
): dict<Tk, Tv>;
- To use an async function, see
Dict\from_keys_async(). - To create a dict from values, see
Dict\from_values(). - To create a dict from key/value tuples, see
Dict\from_entries().
Time complexity: O(n * f), where f is the complexity of $value_func
Space complexity: O(n)
Parameters
Traversable<Tk> $keys(function(Tk): Tv) $value_func
Returns
dict<Tk, Tv>