UniTaskv2.cs

var hoge = new[] { 1, 2, 3 };
Debug.Log($"hoge = {string.Join(", ", hoge)}");
await hoge.ToUniTaskAsyncEnumerable().SelectAwait(async x =>
{
    var delay = Random.Range(0.0f, 1.0f);
    Debug.Log($"x = {x}, Delay = {delay}");
    await UniTask.Delay(TimeSpan.FromSeconds(delay));
    return new { Before = x, After = x + 1 };
}).ForEachAwaitAsync(async x =>
{
    Debug.Log($"Before = {x.Before}, After = {x.After}");
    await UniTask.Delay(TimeSpan.FromSeconds(1));
});