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from_async

Note

This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information.

Returns a new vec with each value awaited in parallel

namespace HH\Lib\Vec;

function from_async<Tv>(
  Traversable<Awaitable<Tv>> $awaitables,
): Awaitable<vec<Tv>>;

Time complexity: O(n * a), where a is the complexity of synchronous portions of each Awaitable Space complexity: O(n)

The IO operations for each Awaitable will happen in parallel.

Parameters​

Returns​