/// `TaskGroup` を使って実装された `race(lhs:rhs:)` /// 本文中に実装を掲載しています let result = await race( lhs: { try? await Task.sleep(for: .seconds(100)) return 100 }, rhs: { try? await Task.sleep(for: .seconds(1)) return 1 } ) print(result) // 1 /// 同期的に `Int` が返ります(処理に0秒かかるとする、同期関数) func num0() -> Int { return 0 } /// 非同期的に `Int` が返ります(処理に1秒かかるとする、非同期関数) func num1() async -> Int { try! await Task.sleep(for: .seco
![Swift の「async let ...」と「TaskGroup」の使い分け早見表](https://cdn-ak-scissors.b.st-hatena.com/image/square/7bb8fd29bdd5519fbeaccfe46482175b0671f33d/height=288;version=1;width=512/https%3A%2F%2Fres.cloudinary.com%2Fzenn%2Fimage%2Fupload%2Fs--3WQVS_EA--%2Fc_fit%252Cg_north_west%252Cl_text%3Anotosansjp-medium.otf_55%3ASwift%252520%2525E3%252581%2525AE%2525E3%252580%25258Casync%252520let%252520...%2525E3%252580%25258D%2525E3%252581%2525A8%2525E3%252580%25258CTaskGroup%2525E3%252580%25258D%2525E3%252581%2525AE%2525E4%2525BD%2525BF%2525E3%252581%252584%2525E5%252588%252586%2525E3%252581%252591%2525E6%252597%2525A9%2525E8%2525A6%25258B%2525E8%2525A1%2525A8%252Cw_1010%252Cx_90%252Cy_100%2Fg_south_west%252Cl_text%3Anotosansjp-medium.otf_34%3Atreastrain%252520%25252F%252520Tanak...%252Cx_220%252Cy_108%2Fbo_3px_solid_rgb%3Ad6e3ed%252Cg_south_west%252Ch_90%252Cl_fetch%3AaHR0cHM6Ly9zdG9yYWdlLmdvb2dsZWFwaXMuY29tL3plbm4tdXNlci11cGxvYWQvYXZhdGFyL2ViMjg2MTZiZGIuanBlZw%3D%3D%252Cr_20%252Cw_90%252Cx_92%252Cy_102%2Fco_rgb%3A6e7b85%252Cg_south_west%252Cl_text%3Anotosansjp-medium.otf_30%3ADeNA%252520Engineers%252Cx_220%252Cy_160%2Fbo_4px_solid_white%252Cg_south_west%252Ch_50%252Cl_fetch%3AaHR0cHM6Ly9saDMuZ29vZ2xldXNlcmNvbnRlbnQuY29tL2EtL0FPaDE0R2lvTGxjaXNjeEYtcmp3QlhkQXBNNTJqUjBsZXBseGFVc3pDQl9kU0lRPXMyNTAtYw%3D%3D%252Cr_max%252Cw_50%252Cx_139%252Cy_84%2Fv1627283836%2Fdefault%2Fog-base-w1200-v2.png)