Macro join_all 

join_all!() { /* proc-macro */ }

Joins multiple futures into an array, waiting for all to complete.

The join_all! macro is like join! but returns an array instead of a tuple. It uses the same concurrent polling expansion, so all branches are driven together within the enclosing task while preserving input order in the returned array.

Syntax

join_all!(future1, future2, ...)

Returns

An array of all the futures’ results in the order they were specified. Since all results must be the same type, this enables easier iteration.

Example

let results: [i32; 3] = join_all!(
    fetch_value(1).await,
    fetch_value(2).await,
    fetch_value(3).await
);
for result in results {
    println!("{}", result);
}