{"id":25546,"date":"2024-10-26T13:50:50","date_gmt":"2024-10-26T13:50:50","guid":{"rendered":"http:\/\/atmokpo.com\/w\/?p=25546"},"modified":"2024-11-26T08:01:24","modified_gmt":"2024-11-26T08:01:24","slug":"%ed%94%8c%eb%9f%ac%ed%84%b0-%ea%b0%95%ec%a2%8c-14-2-%eb%b9%84%eb%8f%99%ea%b8%b0-%eb%b0%a9%ec%8b%9d","status":"publish","type":"post","link":"https:\/\/atmokpo.com\/w\/25546\/","title":{"rendered":"\ud50c\ub7ec\ud130 \uac15\uc88c: 14.2 \ube44\ub3d9\uae30 \ubc29\uc2dd"},"content":{"rendered":"

<\/p>\n

\n
\n

\uc791\uc131\uc790: \uc870\uad11\ud615<\/p>\n

\uc791\uc131\uc77c: [\uc624\ub298 \ub0a0\uc9dc]<\/p>\n<\/header>\n

\n

\ube44\ub3d9\uae30 \ud504\ub85c\uadf8\ub798\ubc0d\uc758 \uc911\uc694\uc131<\/h2>\n

\ubaa8\ub358 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uac1c\ubc1c\uc5d0\uc11c \ube44\ub3d9\uae30 \ud504\ub85c\uadf8\ub798\ubc0d\uc740 \ud544\uc218\uc801\uc778 \uc694\uc18c\uc785\ub2c8\ub2e4. \ud2b9\ud788, \uc0ac\uc6a9\uc790 \uacbd\ud5d8(UX)\uc744 \ud5a5\uc0c1\uc2dc\ud0a4\uace0 \uc751\ub2f5\uc131\uc744 \ub192\uc774\ub294 \ub370 \uc788\uc5b4\uc11c \ube44\ub3d9\uae30 \uc791\uc5c5\uc740 \ub9e4\uc6b0 \uc911\uc694\ud569\ub2c8\ub2e4. \ube44\ub3d9\uae30 \ubc29\uc2dd\uc740 \uc5ec\ub7ec \uc791\uc5c5\uc774 \ub3d9\uc2dc\uc5d0 \uc9c4\ud589\ub420 \uc218 \uc788\ub3c4\ub85d \ud558\uc5ec, \ud55c \uc791\uc5c5\uc774 \uc644\ub8cc\ub418\uae30\ub97c \uae30\ub2e4\ub9ac\ub294 \ub3d9\uc548 \ub2e4\ub978 \uc791\uc5c5\uc744 \uc218\ud589\ud560 \uc218 \uc788\uac8c \ud569\ub2c8\ub2e4. \uc774\ub97c \ud1b5\ud574 \uc0ac\uc6a9\uc790\ub294 \ub354 \ube60\ub974\uace0 \uc6d0\ud65c\ud55c \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<\/section>\n

\n

\ud50c\ub7ec\ud130\uc5d0\uc11c\uc758 \ube44\ub3d9\uae30 \ud504\ub85c\uadf8\ub798\ubc0d<\/h2>\n

\ud50c\ub7ec\ud130\uc5d0\uc11c \ube44\ub3d9\uae30 \ud504\ub85c\uadf8\ub798\ubc0d\uc740 \uc8fc\ub85c Future\uc640 async\/await \ud0a4\uc6cc\ub4dc\ub97c \ud1b5\ud574 \uad6c\ud604\ub429\ub2c8\ub2e4. Flutter\ub294 Dart \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\ub85c \uc791\uc131\ub418\uba70, \ube44\ub3d9\uae30 \ud504\ub85c\uadf8\ub798\ubc0d\uc744 \uc27d\uac8c \ud560 \uc218 \uc788\ub3c4\ub85d \ub2e4\uc591\ud55c \uae30\ub2a5\uc744 \uc9c0\uc6d0\ud569\ub2c8\ub2e4. \uc774\uc81c \ud50c\ub7ec\ud130\uc5d0\uc11c \ube44\ub3d9\uae30 \ud568\uc218\ub97c \uc0ac\uc6a9\ud558\ub294 \ubc29\ubc95\uc744 \uc0b4\ud3b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n<\/section>\n

\n

Future\uc640 \ube44\ub3d9\uae30 \ud568\uc218<\/h2>\n

Future\ub294 \ube44\ub3d9\uae30 \uc791\uc5c5\uc758 \uacb0\uacfc\ub97c \ub098\ud0c0\ub0b4\ub294 \ud074\ub798\uc2a4\uc785\ub2c8\ub2e4. Future \uac1d\uccb4\ub294 \ud5a5\ud6c4 \uc644\ub8cc\ub420 \uc791\uc5c5\uc744 \ub098\ud0c0\ub0b4\uba70, \uc774 \uac1d\uccb4\ub294 \ube44\ub3d9\uae30 \ud568\uc218\uc5d0\uc11c \ubc18\ud658\ub429\ub2c8\ub2e4. \ube44\ub3d9\uae30 \ud568\uc218\ub294 async \ud0a4\uc6cc\ub4dc\ub85c \uc815\uc758\ub418\uace0, \ub0b4\ubd80\uc5d0\uc11c await \ud0a4\uc6cc\ub4dc\ub97c \uc0ac\uc6a9\ud558\uc5ec Future\uac00 \uc644\ub8cc\ub420 \ub54c\uae4c\uc9c0 \uae30\ub2e4\ub9bd\ub2c8\ub2e4.<\/p>\n

\ube44\ub3d9\uae30 \ud568\uc218 \uc608\uc81c<\/h3>\n
\nFuture fetchData() async {\n    await Future.delayed(Duration(seconds: 2));\n    return \"\ub370\uc774\ud130 \ub85c\ub4dc \uc644\ub8cc!\";\n}\n            <\/string><\/code><\/pre>\n
\uc704\uc758 \uc608\uc81c\ub294 2\ucd08 \ub3d9\uc548 \ub300\uae30\ud55c \ud6c4 “\ub370\uc774\ud130 \ub85c\ub4dc \uc644\ub8cc!”\ub77c\ub294 \ubb38\uc790\uc5f4\uc744 \ubc18\ud658\ud558\ub294 \ube44\ub3d9\uae30 \ud568\uc218\uc785\ub2c8\ub2e4.<\/p>\n<\/section>\n
\n
await\uc758 \uc0ac\uc6a9<\/h2>\n
await \ud0a4\uc6cc\ub4dc\ub294 Future\uac00 \uc644\ub8cc\ub420 \ub54c\uae4c\uc9c0 \uae30\ub2e4\ub9ac\uac8c \ud558\uc5ec, \ube44\ub3d9\uae30 \ucf54\ub4dc\uc758 \uc21c\ucc28\uc801\uc778 \uc2e4\ud589\uc744 \uac00\ub2a5\ud558\uac8c \ud569\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, \uc704\uc758 fetchData \ud568\uc218\ub97c \ud638\ucd9c\ud558\ub294 \ubc29\ubc95\uc740 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/p>\n
await \uc608\uc81c<\/h3>\n
\nvoid main() async {\n    print(\"\ub370\uc774\ud130\ub97c \ubd88\ub7ec\uc624\ub294 \uc911...\");\n    String result = await fetchData();\n    print(result);\n}\n            <\/code><\/pre>\n
main \ud568\uc218 \ub610\ud55c async\ub85c \uc815\uc758\ud558\uc600\uc73c\uba70, fetchData \ud568\uc218\uc758 \uacb0\uacfc\ub97c await\ub97c \uc0ac\uc6a9\ud574 \uae30\ub2e4\ub9bd\ub2c8\ub2e4. \uc774\ub97c \ud1b5\ud574 “\ub370\uc774\ud130\ub97c \ubd88\ub7ec\uc624\ub294 \uc911…” \uba54\uc2dc\uc9c0\ub294 \uc989\uc2dc \ucd9c\ub825\ub418\uace0, 2\ucd08 \ud6c4\uc5d0 “\ub370\uc774\ud130 \ub85c\ub4dc \uc644\ub8cc!”\uac00 \ucd9c\ub825\ub429\ub2c8\ub2e4.<\/p>\n<\/section>\n
\n
\ube44\ub3d9\uae30 \uc791\uc5c5\uc758 \uc5d0\ub7ec \ucc98\ub9ac<\/h2>\n
\ube44\ub3d9\uae30 \uc791\uc5c5\uc5d0\uc11c \uc5d0\ub7ec \ucc98\ub9ac\ub294 \uc911\uc694\ud55c \ubd80\ubd84\uc785\ub2c8\ub2e4. try-catch \ube14\ub85d\uc744 \uc0ac\uc6a9\ud558\uc5ec \ube44\ub3d9\uae30 \ud568\uc218\uc5d0\uc11c \ubc1c\uc0dd\ud55c \uc608\uc678\ub97c \ucc98\ub9ac\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
\uc5d0\ub7ec \ucc98\ub9ac \uc608\uc81c<\/h3>\n
\nFuture fetchWithError() async {\n    throw Exception(\"\uc5d0\ub7ec \ubc1c\uc0dd!\");\n}\n\nvoid main() async {\n    try {\n        String result = await fetchWithError();\n        print(result);\n    } catch (e) {\n        print(\"\uc5d0\ub7ec: ${e.toString()}\");\n    }\n}\n            <\/string><\/code><\/pre>\n
\uc704\uc758 \uc608\uc81c\uc5d0\uc11c fetchWithError \ud568\uc218\ub294 \uc608\uc678\ub97c \ub358\uc9d1\ub2c8\ub2e4. main \ud568\uc218\uc5d0\uc11c\ub294 \ud574\ub2f9 \ud568\uc218\uc758 \ud638\ucd9c\uc744 try-catch \ube14\ub85d\uc73c\ub85c \uac10\uc2f8 \uc5d0\ub7ec\ub97c \ucc98\ub9ac\ud569\ub2c8\ub2e4.<\/p>\n<\/section>\n
\n
Future\uc758 \uc5ec\ub7ec \uad00\ub9ac \ubc29\ubc95<\/h2>\n
\ud50c\ub7ec\ud130\uc5d0\uc11c \ube44\ub3d9\uae30 \ucc98\ub9ac\ub97c \ubcf4\ub2e4 \ud6a8\uacfc\uc801\uc73c\ub85c \uad00\ub9ac\ud558\uae30 \uc704\ud574, \uc5ec\ub7ec Future\ub97c \ub3d9\uc2dc\uc5d0 \uc2e4\ud589\ud560 \uc218 \uc788\ub294 \ubc29\ubc95\uc774 \uc81c\uacf5\ub429\ub2c8\ub2e4. \uc5ec\uae30\uc5d0 Future.wait<\/strong> \uba54\uc18c\ub4dc\ub97c \uc0ac\uc6a9\ud558\uba74 \uc5ec\ub7ec Future\ub97c \ub3d9\uc2dc\uc5d0 \uae30\ub2e4\ub9ac\ub294 \uac83\uc774 \uac00\ub2a5\ud569\ub2c8\ub2e4.<\/p>\n
Future.wait \uc608\uc81c<\/h3>\n
\nFuture fetchAllData() async {\n    var first = fetchData();\n    var second = fetchWithError();\n    var results = await Future.wait([first, second]);\n\n    print(results);\n}\n\nvoid main() async {\n    try {\n        await fetchAllData();\n    } catch (e) {\n        print(\"\uc5d0\ub7ec: ${e.toString()}\");\n    }\n}\n            <\/void><\/code><\/pre>\n
fetchAllData \ud568\uc218\ub294 \ub450 \uac1c\uc758 Future\ub97c \ub3d9\uc2dc\uc5d0 \uc2e4\ud589\ud558\uace0, \uacb0\uacfc\ub97c \uae30\ub2e4\ub9bd\ub2c8\ub2e4. \ub450 \ubc88\uc9f8 Future\uac00 \uc5d0\ub7ec\ub97c \ubc1c\uc0dd\uc2dc\ud0a4\uba74 catch \ube14\ub85d\uc5d0\uc11c \uc5d0\ub7ec\ub97c \ucc98\ub9ac\ud569\ub2c8\ub2e4.<\/p>\n<\/section>\n
\n
\uc2a4\ud2b8\ub9bc(Stream)\uc758 \ud65c\uc6a9<\/h2>\n
\uc2a4\ud2b8\ub9bc\uc740 \ube44\ub3d9\uae30 \ub370\uc774\ud130\uc758 \uc5f0\uc18d\uc801\uc778 \ud750\ub984\uc744 \ucc98\ub9ac\ud558\uae30 \uc704\ud55c \uac83\uc785\ub2c8\ub2e4. \ub370\uc774\ud130\uac00 \uc9c0\uc18d\uc801\uc73c\ub85c \ubc1c\uc0dd\ud558\ub294 \uacbd\uc6b0\uc5d0 \uc720\uc6a9\ud569\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, \uc6f9\uc18c\ucf13 \uc5f0\uacb0, \ud30c\uc77c \uc77d\uae30, \ub370\uc774\ud130\ubca0\uc774\uc2a4 \ucffc\ub9ac \ub4f1\uc774 \uc788\uc2b5\ub2c8\ub2e4. \uc2a4\ud2b8\ub9bc\uc740 \uc77c\ub828\uc758 \uc774\ubca4\ud2b8\ub97c \ube44\ub3d9\uae30\uc801\uc73c\ub85c \ucc98\ub9ac\ud569\ub2c8\ub2e4.<\/p>\n
\uc2a4\ud2b8\ub9bc \uc608\uc81c<\/h3>\n
\nStream numberStream() async* {\n    for (int i = 0; i < 5; i++) {\n        await Future.delayed(Duration(seconds: 1));\n        yield i;\n    }\n}\n\nvoid main() async {\n    await for (var number in numberStream()) {\n        print(number);\n    }\n}\n            <\/int><\/code><\/pre>\n
numberStream \ud568\uc218\ub294 \uc2a4\ud2b8\ub9bc\uc744 \uc0dd\uc131\ud558\uace0, 1\ucd08\ub9c8\ub2e4 \uc22b\uc790\ub97c \ucd9c\ub825\ud569\ub2c8\ub2e4. main \ud568\uc218\uc5d0\uc11c\ub294 await for \ud0a4\uc6cc\ub4dc\ub97c \uc0ac\uc6a9\ud558\uc5ec \uc2a4\ud2b8\ub9bc\uc758 \ub370\uc774\ud130\uc5d0 \uc811\uadfc\ud569\ub2c8\ub2e4.<\/p>\n<\/section>\n
\n
\ube44\ub3d9\uae30 \ud504\ub85c\uadf8\ub798\ubc0d\uc758 \ubaa8\ubc94 \uc0ac\ub840<\/h2>\n
\ube44\ub3d9\uae30 \ud504\ub85c\uadf8\ub798\ubc0d\uc744 \ud560 \ub54c \uba87 \uac00\uc9c0 \ubaa8\ubc94 \uc0ac\ub840\ub97c \ub530\ub974\ub294 \uac83\uc774 \uc911\uc694\ud569\ub2c8\ub2e4:<\/p>\n