{"id":449,"date":"2020-04-27T09:00:54","date_gmt":"2020-04-27T00:00:54","guid":{"rendered":"http:\/\/mobilelab.khu.ac.kr\/?p=449"},"modified":"2021-06-13T16:24:21","modified_gmt":"2021-06-13T07:24:21","slug":"be-dart-programmer-15","status":"publish","type":"post","link":"http:\/\/mobilelab.khu.ac.kr\/wordpress\/2020\/04\/27\/be-dart-programmer-15\/","title":{"rendered":"Dart Programmer \ub418\uae30 [15]"},"content":{"rendered":"\n

< Dart \uae30\ucd08\ubb38\ubc95 – List ><\/h4>\n\n\n\n

List\ub294 \uac19\uc740 \ud0c0\uc785 \ud639\uc740 \uc11c\ub85c \ub2e4\ub978 \ud0c0\uc785\uc758 \ub370\uc774\ud0c0\ub97c \ubcf5\uc218 \uac1c \uc800\uc7a5\ud558\ub294\ub370 \ub9e4\uc6b0 \uc720\uc6a9\ud55c \ub370\uc774\ud0c0 \ud0c0\uc785\ub2c8\ub2e4. List\ub294 \ub300\ubd80\ubd84\uc758 \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\uc5d0\uc11c \uc9c0\uc6d0\ud558\uba70, \ubc30\uc5f4(Array)\ub77c\uace0\ub3c4 \ubd88\ub9bd\ub2c8\ub2e4.<\/p>\n\n\n\n

List Creation & Basic Manipulaion<\/h4>\n\n\n\n

\uc608\uc81c\ub97c \ud1b5\ud574\uc11c\ub3c4 \uc54c\uc544\ubcf4\uaca0\uc9c0\ub9cc, \uc77c\ubc18 \ubcc0\uc218\ub97c \uc120\uc5b8\ud558\ub294 \ubc29\uc2dd\uc778 var myList; \ubb38\ubc95\uc744 \uc0ac\uc6a9\ud558\uc5ec \ub9cc\ub4e4\uc218\ub3c4 \uc788\uace0, generic \ubb38\ubc95\uc774\ub77c\uace0 \ud558\ub294 List<int> myList; \ubb38\ubc95\uc744 \uc0ac\uc6a9\ud574\uc11c\ub3c4 \ub9cc\ub4e4\uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc804\uc790\ub294 Dart \uc5b8\uc5b4\uc5d0\uac8c \uc54c\uc544\uc11c List \ub370\uc774\ud0c0 \ud0c0\uc785\uc744 \uc815\ud574 \ub2ec\ub77c\uace0 \ud558\ub294 \uac83\uc774\uace0, \ud6c4\uc790\ub294 int \ub370\uc774\ud0c0 \ud0c0\uc785\uc744 \uc800\uc7a5\ud55c List\ub97c \ub9cc\ub4e4\uc5b4 \ub2ec\ub77c\ub294 \uac83\uc785\ub2c8\ub2e4. \uc544\ub798\uc758 darttutorial-15-01.dart\uc608\uc81c \ud504\ub85c\uadf8\ub7a8\uc744 \ud1b5\ud574\uc11c List\uc758 \uc758\ubbf8\uc640 \uc0ac\uc6a9 \ubc29\ubc95\uc744 \uc790\uc138\ud558\uac8c \uc54c\uc544\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \ub2e4\uc591\ud55c \ub0b4\uc6a9\uc774 \ub4e4\uc5b4\uac00 \uc788\ub294 \uc774\uc720\ub85c \uc124\uba85\uc744 \uc6a9\uc774\ud558\uac8c \ud558\uae30 \uc704\ud558\uc5ec \uac01\uac01\uc758 \uae30\ub2a5\ubcc4\ub85c #1\uacfc \uac19\uc774 \ubc88\ud638\ub97c \ub9e4\uae30\uc5b4 \ub450\uc5c8\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n

\/\/ darttutorial-15-01.dart\n\n\/\/ Print the type of object\nString getObjectType(var para) {\n  if(para is List<int>) {\n    return (\"_List<int>_\");\n  } else if(para is List<dynamic>) {\n    return (\"_List<dynamic>_\");\n  } else {\n    return (\"_Unknown_\");\n  }\n}\n\nvoid main() {\n  \/\/ #1 Simple list with three integers\n  var myList1 = [1, 2, 3];\n  print(\"1> myList1(\" + getObjectType(myList1) + \") has ${myList1.length} items: $myList1\");\n\n  \/\/ #2 List element access using index operator\n  for(var index = 0; index < myList1.length; index++) {\n    myList1[index] *= index;\n  }\n  print(\"2> myList1(\" + getObjectType(myList1) + \") has ${myList1.length} items: $myList1\");\n\n  \/\/ #3 Generic List for heterogeneous data type encapsulation\n  List myList2 = [1, 2.0, \"myName\"];\n  print(\"3> myList2(\" + getObjectType(myList2) + \") has ${myList2.length} items: $myList2\");\n\n  \/\/ #4 Constant value assignment for List - 1\n  myList1 = const [11, 12, 13, 14, 15];\n  print(\"4> myList1(\" + getObjectType(myList1) + \") has ${myList1.length} items: $myList1\");\n\n  \/\/ #5 Constant value assignment for List - 2\n\/\/myList1[0] = 1; \/\/ Error\n  myList1 = const [101, 102, 103, 104, 105];\n  print(\"5> myList1(\" + getObjectType(myList1) + \") has ${myList1.length} items: $myList1\");\n\n  \/\/ #6 ... Operator in List creation - 1\n  myList1 = [1, 2, 3];\n  var myList3 = [...myList1, 4, 5, 6];\n  print(\"6> myList3(\" + getObjectType(myList3) + \") has ${myList3.length} items: $myList3\");\n\n  \/\/ #7 ... Operator in List creation - 2\n  var myList4;\n\/\/myList1 = [...myList4, 4, 5, 6]; \/\/ Error\n  myList1 = [...?myList4, 4, 5, 6];\n  print(\"7> myList1(\" + getObjectType(myList1) + \") has ${myList1.length} items: $myList1\");\n  \n  \/\/ #8 if Statement in List creation  \n  var myList5 = [...?myList1, if(myList2.length != 0) ...?myList2 ];\n  print(\"8> myList5(\" + getObjectType(myList5) + \") has ${myList5.length} items: $myList5\");\n\n  \/\/ #9 for Statement for List manipulation\n  for(var item in myList5) {\n    print(\"9>> $item\");\n  }\n\n  \/\/ #10 for Statement in List creation\n  var myList6 = ['#0', for(var item in myList5) \"#$item\"];\n  print(\"10> myList6(\" + getObjectType(myList6) + \") has ${myList6.length} items: $myList6\");\n}\n<\/dynamic><\/dynamic><\/dynamic><\/int><\/int><\/pre>\n\n\n\n
List\ub97c \ub9cc\ub4e4\uace0 \uac04\ub2e8\ud558\uac8c \ub2e4\ub8e8\ub294 main()\uc758 \uc124\uba85\uc5d0 \uc55e\uc11c, \uac04\ub2e8\ud55c \ud568\uc218\uac00 \ud558\ub098 \ud3ec\ud568\ub418\uc5b4 \uc788\ub294 \uac83\uc744 \ubcfc \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774\ub984\uc740 getObjectType() \uc73c\ub85c, \uc785\ub825 \ud30c\ub77c\uba54\ud0c0\ub85c \ud074\ub798\uc2a4 \uac1d\uccb4\ub97c \ud558\ub098 \ubc1b\uc544\uc11c, \uc774\uc758 \ud0c0\uc785\uc5d0 \ud574\ub2f9\ud558\ub294 \ubb38\uc790\uc5f4\uc744 return \ud558\ub294 \ud568\uc218\uc785\ub2c8\ub2e4. \uc55e\uc11c \uc124\uba85\ud55c generic\ud55c \ud615\ud0dc\ub85c,  \uac04\ub2e8\ud558\uac8c int \ub370\uc774\ud0c0\ub97c \uc800\uc7a5\ud558\ub294 List<int>\uc640 dynamic \ub370\uc774\ud0c0\ub97c \uc800\uc7a5\ud558\uc5ec, \uc0ac\uc2e4\uc0c1 \uc11c\ub85c \ub2e4\ub978 \ud615\ud0dc\uc758 \ub370\uc774\ud0c0\ub97c \ud558\ub098\uc758 List\uc5d0 \uc800\uc7a5\ud560 \uc218 \uc788\ub294 List<dynamic> \ud0c0\uc785\ub9cc \uc2dd\ubcc4\ud558\ub294 \uac04\ub2e8\ud55c \ud568\uc218\uc785\ub2c8\ub2e4. \ub450\uac00\uc9c0 \ud0c0\uc785\uc5d0 \ubd80\ud569\ud558\uc9c0 \uc54a\uc73c\uba74, “Unknown”\uc73c\ub85c return \ud569\ub2c8\ub2e4. \uadf8\ub9ac\uace0 \ud504\ub85c\uadf8\ub7a8\uc758 \uc218\ud589\uacb0\uacfc\ub97c \uc544\ub798\uc640 \uac19\uc774 \ubbf8\ub9ac \ub098\ud0c0\ub0b4\uc5c8\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
\"\"
[\uadf8\ub9bc 1] List Creation & Basic Manipulation \ud504\ub85c\uadf8\ub7a8 \uc218\ud589 \uacb0\uacfc<\/figcaption><\/figure>\n\n\n\n
#1\uc740 \uac00\uc7a5 \uac04\ub2e8\ud55c \ud615\ud0dc\uc778 \uc815\uc218\ub97c \uc800\uc7a5\ud558\ub294 List\ub97c \ub9cc\ub4dc\ub294 \uac83\uc744 \ubcf4\uc5ec\uc90d\ub2c8\ub2e4. List\ub294 [ … ] \uad04\ud638\ub85c \ub9cc\ub4e4\uc5b4 \uc9c0\uba70, \uc548\uc5d0 \uc800\uc7a5\ud560 \uac12\ub4e4\uc744 ‘,’ \uc27c\ud45c \uae30\ud638\ub97c \uc0ac\uc6a9\ud558\uc5ec \ub098\uc5f4\ud558\uba74 \ub429\ub2c8\ub2e4. \uc800\uc7a5\ud558\ub294 \uac12\ub4e4\uc774 int \ud0c0\uc785\uc774\uc9c0\ub9cc, var \ubcc0\uc218 \ud0c0\uc785\uc744 \uc0ac\uc6a9\ud568\uc73c\ub85c\uc11c, Dart \uc5b8\uc5b4\uc5d0\uac8c \uc54c\uc544\uc11c \ud0c0\uc785\uc744 \ub9cc\ub4e4\uc5b4 \ub2ec\ub77c\uace0 \ud558\ub294 \uac83\uc774\uba70, \uc774\ub294 \uc55e\uc11c\uc5d0\uc11c \uc124\uba85\ud588\ub358 type inference \uae30\ub2a5\uc758 \uc77c\uc885\uc785\ub2c8\ub2e4. print \uad6c\ubb38\uc774 \uc2e4\ud589\ub418\uba74, Dart \uc5b8\uc5b4\uac00 \uc54c\uc544\uc11c int \ub370\uc774\ud0c0\uac00 \uc800\uc7a5\ub41c List\uc778 List<int> \ud0c0\uc785\uc73c\ub85c myList1\uc744 \ub9cc\ub4e0\uac83\uc744 \ud655\uc778 \ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uadf8\ub9ac\uace0 \ud074\ub798\uc2a4\uc758 \uba64\ubc84 property\uc778 length\ub97c \ud1b5\ud574\uc11c 3\uac1c\uc758 element\uac00 \ub4e4\uc5b4 \uc788\uc74c\uc744 \ud655\uc778\ud558\uc600\uace0, print \uad6c\ubb38\uc5d0 List \uc774\ub984\uc744 \uc801\uc5b4\uc90c\uc73c\ub85c\uc368, myList1 \uc548\uc758 Element\ub4e4\uc744 \ud654\uba74\uc5d0 \ucd9c\ub825\ud574 \ubcf4\uc558\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
#2\ub294 for \ubc18\ubcf5\ubb38\uc744 \uc0ac\uc6a9\ud574\uc11c, List\uc758 element\uc5d0 \uc811\uadfc \ud558\ub294 \uac83\uc744 \ubcf4\uc5ec\uc90d\ub2c8\ub2e4. String\uc5d0\uc11c \ubc30\uc6b4 index operator\ub97c \ub3d9\uc77c\ud558\uac8c \uc0ac\uc6a9\ud558\uace0 \uc788\uc73c\uba70, \ub9e8 \ucc98\uc74c element\uc778 0\ubc88\uc9f8 element \ubd80\ud130 List\uc758 \uae38\uc774\ub9cc\ud07c \ubc18\ubcf5\ud558\uba74\uc11c, element \ub4e4\uc5d0 \uac04\ub2e8\ud55c \uacf1\uc148\uc744 \ud558\uc5ec \uac12\uc744 \uc5c5\ub370\uc774\ud2b8 \ud558\ub294 \uac83\uc744 \ubcfc \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
#3\uc740 \uc11c\ub85c \ub2e4\ub978 \ub370\uc774\ud0c0 \ud0c0\uc785\uc744 \ud558\ub098\uc758 List\uc5d0 \uc800\uc7a5\ud558\uae30 \uc704\ud558\uc5ec, dynamic \ud0c0\uc785\uc73c\ub85c List\ub97c \ub9cc\ub4e4\uc5b4 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4. myList2\ub97c \ubcf4\uba74 \uc815\uc218 1, \uc2e4\uc218 2.0, \uadf8\ub9ac\uace0 \ubb38\uc790\uc5f4 “myName”\uc744 \ud568\uaf10 \uc800\uc7a5\ud558\ub294 \uac83\uc744 \ubcfc \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uadf8\ub9ac\uace0 \ud0c0\uc785\uc744 \ucd9c\ub825\ud574 \ubcf4\uba74, List<dynamic>\uc73c\ub85c \ub098\ud0c0\ub098\ub294 \uac83\uc744 \ud655\uc778 \ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
#4\ub294 \uc0c1\uc218\ud615 List\ub97c myList1\uc5d0 \uc800\uc7a5\ud569\ub2c8\ub2e4. \uc0c1\uc218\ud615 List\ub77c\ub294 \ub2e8\uc5b4\uac00 \ub0af\uc124\uc218\ub3c4 \uc788\uc9c0\ub9cc, \ub9d0\uadf8\ub300\ub85c \uc0c1\uc218\uc785\ub2c8\ub2e4. \uc989, \ub4f1\ud638\uc758 \uc624\ub978\ucabd\uc758 const [11, 12, 13, 14, 15]\ub294 5\uac1c\uc758 element\ub97c \uac00\uc9c4 List\uc778\ub370, \uc774 \ub2e4\uc12f\uac00\uc9c0\uc758 \uac12\uc740 \ubc14\ub014\uc218 \uc5c6\ub2e4\ub294 \uc758\ubbf8\uc785\ub2c8\ub2e4. #5\uc758 myList1[0] = 1;\ub97c \uc8fc\uc11d \ucc98\ub9ac \ud558\uc600\ub294\ub370, \uc774\ub97c \uc2e4\uc81c\ub85c \uc2e4\ud589\ud558\uba74 \uc5d0\ub7ec\uac00 \ub0a9\ub2c8\ub2e4. \uc774\uc720\ub294 myList1\uc774 \uac00\ub9ac\ud0a4\ub294 \uac12\uc774 \uc0c1\uc218\uc778\ub370, \uc774\uc758 0\ubc88\uc9f8 \uac12\uc744 \ubc14\uafb8\ub824 \ud558\ub2c8, \uc0c1\uc218 \uac12 \ubcc0\uacbd \uc2dc\ub3c4\ub85c \uc778\ud558\uc5ec \uc5d0\ub7ec\uac00 \ub098\ub294 \uac83 \uc785\ub2c8\ub2e4.<\/p>\n\n\n\n
#5\ub294 \uc0c1\uc218\ud615 List\ub97c \uc800\uc7a5\ud558\uace0 \uc788\ub294 myList1\uc758 \uac12\uc744 \ub2e4\ub978 \uc0c1\uc218\ud615 List\ub85c \ubcc0\uacbd\ud558\ub294 \uc608\uc81c\uc785\ub2c8\ub2e4. \ud5f7\uac08\ub9ac\uc9c0 \ub9d0\uc544\uc57c\ud560 \uc0ac\ud56d\uc740 myList1\uc740 \ubcc0\uc218\uc785\ub2c8\ub2e4. \ub530\ub77c\uc11c \uc800\uc7a5\ud558\ub294 \uac12\uc740 \ubc14\ub014\uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc800\uc7a5\ud558\uace0 \uc788\ub294 \uac12\uc774 \uc0c1\uc218\ub85c\uc11c, \uc774 \uac12 \ub0b4\ubd80\ub97c \ubc14\uafb8\uc9c0 \ubabb\ud560 \ubfd0\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n
#6\uc5d0\ub294 \uc0c8\ub85c\uc6b4 List \ubb38\ubc95\uc778 “…List\uba85”\uc744 \ubcfc \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774\ub294 List\uba85\uc548\uc758 \ubaa8\ub4e0 element\ub97c \uac00\uc838\uc628\ub2e4\ub294 \uc758\ubbf8\uc785\ub2c8\ub2e4. \ub530\ub77c\uc11c myList3 = […myList1, 4, 5, 6];\ub294 1) myList1\uc758 \ubaa8\ub4e0 element\ub97c \uaebc\ub0b4\uc11c \uc0c8\ub85c\uc6b4 List\uc5d0 \uc800\uc7a5\uc744 \ud569\ub2c8\ub2e4. 2) \ucd94\uac00\ub85c \uba85\uc2dc\ud55c \uc815\uc218 4,5,6\uc744 \uc0c8\ub85c\uc6b4 List\uc758 \ub4b7\ubd80\ubd84\uc5d0 \ucd94\uac00\ud569\ub2c8\ub2e4. \uc774\ub807\uac8c \ub9cc\ub4e0 \uc0c8\ub85c\uc6b4 List\ub97c myList3\uc5d0 \uc800\uc7a5\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n
#7\uc740 #6\uc5d0\uc11c \ubcf8 List \ubb38\ubc95\uc778 “…List\uba85”\uc5d0 \ucd94\uac00 \uae30\ub2a5\uc744 \ud3ec\ud568\ub41c \ubb38\ubc95\uc785\ub2c8\ub2e4. ?\uc758 \uc758\ubbf8\ub294 \ud574\ub2f9 List\uac00 \ube44\uc5b4 \uc788\uc9c0 \uc54a\uc73c\uba74, #6\uacfc \ub3d9\uc77c\ud558\uac8c \ucc98\ub9ac\ud558\uc9c0\ub9cc, \ub9cc\uc57d List\uc5d0 element\uac00 \uc5c6\ub294 null \uc0c1\ud0dc\uc774\uba74, \uc5d0\ub7ec \uc5c6\uc774 \ub2e4\uc74c \ub2e8\uacc4\ub85c \ub118\uc5b4\uac00\uc11c, \uc815\uc218 4,5,6\uc744 \ucd94\uac00\ud558\uaca0\ub2e4\ub294 \uc758\ubbf8\uc785\ub2c8\ub2e4. #6\uc5d0\uc11c\ub294 myList1\uc774 null\uc778 \uacbd\uc6b0, \uc5d0\ub7ec\uac00 \ubc1c\uc0dd\ud558\uac8c \ub429\ub2c8\ub2e4.<\/p>\n\n\n\n
#8\uc740 #7\uc758 \ubb38\ubc95\uc73c\ub85c \uc0c8\ub85c\uc6b4 \ub9ac\uc2a4\ud2b8\uc758 \uc55e\uc744 \ucc44\uc6b4\ud6c4, \uc0c8\ub85c\uc6b4 \ubb38\ubc95\uc744 \ud1b5\ud574\uc11c \ud6c4\ubc18\ubd80\ub97c \ucc44\uc6b0\uac8c \ub429\ub2c8\ub2e4. \uc0c8\ub85c\uc6b4 \ubb38\ubc95\uc774 if(myList2.length != 0) …?myList2\ub85c \ub418\uc5b4 \uc788\ub294\ub370, \ud2b9\uc774\ud574 \ubcf4\uc774\uc9c0\ub9cc, List \uc548\uc744 \ucc44\uc6b8\ub54c\uc5d0\ub3c4 if \uc870\uac74\ubb38\uc758 \uc0ac\uc6a9\uc774 \uac00\ub2a5\ud569\ub2c8\ub2e4. \uc774 \uacbd\uc6b0\ub294 myList2\uc758 \uae38\uc774\uac00 0\uc774 \uc544\ub2c8\uba74, myList2\uc758 \ub0b4\uc6a9\uc744 \ud6c4\ubc18\ubd80\uc5d0 \ucd94\uac00\ud55c\ub2e4\ub294 \ub0b4\uc6a9\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n
#9\ub294 for \uad6c\ubb38\uc774 List\uc640 \uac19\uc774 \ubcf5\uc218\uc758 \ub370\uc774\ud0c0\ub97c \uc800\uc7a5\ud558\ub294 \ub370\uc774\ud0c0 \ud0c0\uc785\uacfc \uc4f0\uc77c\ub54c \uc6a9\uc774\ud55c for-in \ubb38\ubc95\uc744 \ubcf4\uc5ec\uc90d\ub2c8\ub2e4. \uc758\ubbf8\ub294 \ub2e8\uc21c\ud569\ub2c8\ub2e4. myList5\uc548\uc5d0 \uc788\ub294 \uc544\uc774\ud15c\uc744 \ubc18\ubcf5\ubb38\uc774 \uc218\ud589\ub420\ub54c\ub9c8\ub2e4 \ud558\ub098\uc529 \uaebc\ub0b4\uc11c, item\uc5d0 \uc800\uc7a5\ud55c\ub2e4\ub294 \uc758\ubbf8\uc785\ub2c8\ub2e4. \uc77c\ubc18\uc801\uc73c\ub85c for \uad6c\ubb38\uc744 \uc0ac\uc6a9\ud558\uba74, \uc784\uc2dc \ubcc0\uc218\ub97c \ub46c\uc11c \ucc98\uc74c\ubd80\ud130 \ub05d\uae4c\uc9c0 \uc778\ub371\uc2a4\ub97c \ub9e4\uae30\uba74\uc11c \uc218\ud589\ud558\uc9c0\ub9cc, for-in \ubb38\ubc95\uc744 \uc0ac\uc6a9\ud558\uba74, \uc790\ub3d9\uc73c\ub85c element\ub97c \ud558\ub098\uc529 \uaebc\ub0b4\uae30 \ub54c\ubb38\uc5d0 \uc778\ub371\uc2a4\ub97c \uc0ac\uc6a9\ud558\ub2e4\uac00 \uc2e4\uc218\ub85c List\uc5d0 \uc18d\ud558\uc9c0 \uc54a\uc740 \ub370\uc774\ud0c0\uc5d0 \uc811\uadfc\ud560\uc218 \uc788\ub294 \uc5d0\ub7ec\ub97c \ubc29\uc9c0\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n
#10\uc740 #8\ucc98\ub7fc List\ub97c \ucc98\uc74c \ub9cc\ub4dc\ub294 \uc2dc\uc810\uc5d0\uc11c if \uad6c\ubb38\ucc98\ub7fc for \ubc18\ubcf5\ubb38\ub3c4 \uc0ac\uc6a9\uc774 \uac00\ub2a5\ud55c \uac83\uc744 \ubcf4\uc5ec\uc8fc\ub294 \uc608\uc81c\uc785\ub2c8\ub2e4. \uc218\ud589 \uacb0\uacfc\ub97c \ubcf4\uba74 \uc54c\uaca0\uc9c0\ub9cc, \ub9e8 \ucc98\uc74c “#0″\uc758 \ubb38\uc790\uc5f4\uc744 \uc800\uc7a5\ud55c \ud6c4, \uc774\ud6c4 \uc22b\uc790\uac00 \ubc14\ub010 \ubb38\uc790\uc5f4\uc744 \ud558\ub098 \ud558\ub098 List\uc758 \ub05d\uc5d0 \ucd94\uac00\ud558\uac8c \ub429\ub2c8\ub2e4.<\/p>\n\n\n\n
Understanding of List Class Features<\/h4>\n\n\n\n
List\uc5d0 \ub300\ud574\uc11c \uac04\ub2e8\ud788 \uc54c\uc544\ubcf4\uc558\uc2b5\ub2c8\ub2e4. \uc774\ubc88\uc5d0\ub294 List \ud074\ub798\uc2a4 \ub0b4\ubd80\uc758 \uba64\ubc84 \ub370\uc774\ud0c0\uc640 \uba64\ubc84 \uba54\uc18c\ub4dc \ub4f1\uc5d0 \ub300\ud574\uc11c \uc54c\uc544\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \ubcf4\ub2e4 \uad6c\uccb4\uc801\uc778 \ub0b4\uc6a9\uc740 Dart \uacf5\uc2dd \ud648\ud398\uc774\uc9c0\ub97c \ucc38\uc870\ud558\uc2dc\uae30 \ubc14\ub78d\ub2c8\ub2e4 [\ucc38\uc870<\/a>]. \uc544\ub798\uc758 darttutorial-15-02.dart \uc608\uc81c \ud504\ub85c\uadf8\ub7a8\uc744 \ud1b5\ud574\uc11c \uc880 \ub354 List\uc5d0 \ub300\ud574\uc11c \uc54c\uc544\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
\n\/\/ darttutorial-15-02.dart\n\/\/ Reference: https:\/\/api.dart.dev\/stable\/2.7.1\/dart-core\/List-class.html \n\n\/\/ Print the type of object\nString getObjectType(var para) {\n  if(para is List) {\n    return (\"_List_\");\n  } else if(para is List) {\n    return (\"_List_\");\n  } else {\n    return (\"_Unknown_\");\n  }\n}\n\nvoid main() {\n  \/\/ #1 List sample\n  List myList1 = [1, 2, 3];\n  print(\"#1 \" + getObjectType(myList1) + \" :: $myList1 :: ${myList1.length}\");\n\n  \/\/ #2 List properties\n  myList1 = [1, 2, 3];\n  print(\"#2 \" + \"${myList1.first} :: ${myList1[1]} :: ${myList1.last} :: ${myList1.length}\");\n\n  \/\/ #3 List manipulation using property\n  myList1.length = 0;\n  print(\"#3 \" + getObjectType(myList1) + \" :: $myList1 :: ${myList1.length}\");\n\n  \/\/ #4 add() method\n  myList1.add(4);\n  print(\"#4 \" + getObjectType(myList1) + \" :: $myList1 :: ${myList1.length}\");  \n\n  \/\/ #5 addAll() method\n  myList1.addAll([5, 6, 7]);\n  print(\"#5 \" + getObjectType(myList1) + \" :: $myList1 :: ${myList1.length}\");  \n\n  \/\/ #6 clear() method\n  myList1.clear();\n  print(\"#6 \" + getObjectType(myList1) + \" :: $myList1 :: ${myList1.length}\");    \n\n  \/\/ #7 indexOf() method\n  var myList2 = [\"C++\", \"Dart\", \"Python\"];\n  print(\"#7 \" + myList2.indexOf(\"Dart\").toString());\n\n  \/\/ #8 insert() method\n  myList2.insert(1, \"Go\");\n  print(\"#8 \" + getObjectType(myList2) + \" :: $myList2 :: ${myList2.length}\");    \n\n  \/\/ #9 sort() method (by length)\n  myList2.sort((a,b) => a.length.compareTo(b.length));\n  print(\"#9 \" + getObjectType(myList2) + \" :: $myList2 :: ${myList2.length}\"); \n\n  \/\/ #10 sort() method (by alphabet sequence)\n  myList2.sort((a,b) => a.compareTo(b));\n  print(\"#10 \" + getObjectType(myList2) + \" :: $myList2 :: ${myList2.length}\"); \n}\n<\/pre>\n\n\n\n
\uba3c\uc800 darttutorial-15-02.dart \ud504\ub85c\uadf8\ub7a8\uc758 \uc218\ud589\uacb0\uacfc\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4. \uc18c\uc2a4 \ud504\ub85c\uadf8\ub7a8\uc744 \ub208\uc73c\ub85c \uc0b4\ud3b4\ubcf4\uba74\uc11c \uacb0\uacfc\ub97c \ubbf8\ub9ac \uc608\uce21\ud558\uace0, \uc2e4\uc81c \uc218\ud589 \uacb0\uacfc\uc640 \ud568\uaed8 \ube44\uad50\ud574 \ubcf4\uae30 \ubc14\ub78d\ub2c8\ub2e4.<\/p>\n\n\n\n
\"\"
[\uadf8\ub9bc 2] darttutorial-15-02.dart \uc218\ud589 \uacb0\uacfc<\/figcaption><\/figure>\n\n\n\n
darttutorial-15-02.dart\uc758 #1\uc740 darttutorial-15-12.dart\uc5d0\uc11c \uc774\ubbf8 \uc124\uba85\ud55c \uac83 \ucc98\ub7fc, generic \ud615\ud0dc\ub85c int \ub370\uc774\ud0c0 \ud0c0\uc785\uc744 \ubcf5\uc218\uac1c \uac00\uc9c0\ub294 myList1\uc744 \ub9cc\ub4e0 \uac81\ub2c8\ub2e4.<\/p>\n\n\n\n
#2\ub294 List \ud074\ub798\uc2a4\uc758 property\uc778 first, last\ub97c \ud1b5\ud574\uc11c List \uc548\uc758 \uccab\ubc88\uc9f8\uc640 \ub9c8\uc9c0\ub9c9 element\uc758 \ub0b4\uc6a9\uc744 \ud655\uc778\ud558\ub294 \ubb38\ubc95\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n
#3\ub294 property\uc778 length\ub97c 0\uc73c\ub85c \ud558\ub294 \uac83\uc778\ub370, \uc774\ub807\uac8c \ud558\uba74, List\uac00 \uac00\uc9c0\uace0 \uc788\ub294 \ubaa8\ub4e0 \ub370\uc774\ud0c0\ub97c \uc81c\uac70\ud558\ub77c\ub294 \uc758\ubbf8\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n
#4\ub294 add() \uba54\uc18c\ub4dc \uc785\ub2c8\ub2e4. \uc774\ub294 \ud604\uc7ac List\uc758 \ub9c8\uc9c0\ub9c9 \ub05d\uc5d0 \uc785\ub825 \ud30c\ub77c\uba54\ud0c0\ub85c \uc8fc\uc5b4\uc9c4 element\ub97c \ucd94\uac00\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n
#5\ub294 addAll() \uba54\uc18c\ub4dc\ub85c\uc11c, \uc8fc\uc5b4\uc9c4 \uc785\ub825 \ud30c\ub77c\uba54\ud0c0\uc778 List\uc758 element \ub4e4\uc744 \uaebc\ub0b4\uc11c, \uc8fc\uc5b4\uc9c4 List\uc758 \ub05d\uc5d0 \ud558\ub098 \ud558\ub098 \ucd94\uac00\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n
#6\ub294 clear() \uba54\uc18c\ub4dc\ub85c\uc11c, List\uc758 \ubaa8\ub4e0 element\ub97c \uc0ad\uc81c\ud569\ub2c8\ub2e4. \ub530\ub77c\uc11c \uc55e\uc11c\uc758 property\uc778 length\ub97c 0\uc73c\ub85c \ud558\ub294 \uac83\uacfc \uac19\uc740 \ub0b4\uc6a9\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n
#7\uc5d0\uc11c\ub294 \ubb38\uc790\uc5f4\uc744 \uac00\uc9c0\uace0 \uc788\ub294 List\uc778 myList2\ub97c \ub9cc\ub4e4\uc5c8\uc2b5\ub2c8\ub2e4. myList2.indexOf(“Dart”).toString()\ub294 \uc67c\ucabd\ubd80\ud130 \uc624\ub978\ucabd\uc73c\ub85c \uc774\ud574\ub97c \ud558\uba74\ub429\ub2c8\ub2e4. \uba3c\uc800, myList2\uc5d0\uc11c “Dart” \ubb38\uc790\uc5f4\uc774 \uba87\ubc88\uc9f8\uc5d0 \ub4e4\uc5b4\uac00 \uc788\ub294\uc9c0 \uc778\ub371\uc2a4 \uac12\uc744 \ud655\uc778\ud569\ub2c8\ub2e4. \uadf8\ub7ec\uba74 \uc815\uc218 1\uc774 \ub098\uc635\ub2c8\ub2e4. \uadf8\ub7ec\uba74 1.toString()\uacfc \uac19\uc740 \uc758\ubbf8\ub85c \ub2e4\uc2dc \uc774\uc5b4\uc9c0\ub294\ub370, \uc815\uc218 1\uc744 \ubb38\uc790\uc5f4\ub85c \ub9cc\ub4e0 \uac83\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n
#8\uc740 insert()\ub85c\uc11c \uccab\ubc88\uc9f8 \uc785\ub825\ud30c\ub77c\uba54\ud0c0\ub294 List\uc5d0\uc11c\uc758 element\uc758 \uc704\uce58\uc785\ub2c8\ub2e4. \uadf8\ub9ac\uace0 \uc774 \uc704\uce58\uc5d0 \ub450\ubc88\uc9f8 \ud30c\ub77c\uba54\ud0c0\ub97c \uc0bd\uc785\ud558\ub294 \ubb38\ubc95\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n
#9\ub294 \uc21c\uc11c\ub300\ub85c \uc815\ub82c\uc744 \uc218\ud589\ud558\ub294 sort() \uba54\uc18c\ub4dc \uc785\ub2c8\ub2e4. List \uc790\uccb4\ub97c \uc8fc\uc5b4\uc9c4 \uc21c\uc11c\uc5d0 \ub9de\ub3c4\ub85d \ubc14\uafb8\ub294 \uc791\uc5c5\uc744 \ud569\ub2c8\ub2e4. sort \uba54\uc18c\ub4dc\ub294 \uc785\ub825 \ud30c\ub77c\uba54\ud0c0\ub85c \uc5b4\ub5bb\uac8c \uc815\ub82c\uc744 \ud560\uac74\uc9c0\uc5d0 \ub300\ud55c \uc870\uac74\uc744 \ube44\uad50 \ud568\uc218 \ud558\ub098\ub97c \uc8fc\uc5b4\uc57c \ud569\ub2c8\ub2e4. \uc9c0\uae08\uc740 anonymous \ud568\uc218\ub85c (a,b) => a.length.compareTo(b.length)\uac00 \uc8fc\uc5b4\uc838 \uc788\ub294 \uac83\uc744 \ubcfc\uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774 \ud568\uc218\ub294 \uc785\ub825 \ud30c\ub77c\uba54\ud0c0 \ub450\uac1c\ub97c \ubc1b\uc2b5\ub2c8\ub2e4. \uadf8\ub9ac\uace0 \ub450 \uc785\ub825 \ud30c\ub77c\uba54\ud0c0\uc758 \uae38\uc774\ub97c \ube44\uad50\ud569\ub2c8\ub2e4. \uacb0\uad6d \uc9c0\uae08\uc758 sort\ub294 \uc9e7\uc740 \ubb38\uc790\uc5f4\uc5d0\uc11c \uae34 \ubb38\uc790\uc5f4\ub85c List \uc548\uc758 \ub2e8\uc5b4\ub4e4\uc744 \uc815\ub82c\ud574 \uc90d\ub2c8\ub2e4.<\/p>\n\n\n\n
#10\uc740 \ub2e4\uc2dc \ud55c\ubc88 \uc815\ub82c\uc744 \ud558\ub294\ub370, \uc774\ubc88\uc5d0 \ube44\uad50 \ubb38\ubc95\uc740 (a,b) => a.compareTo(b)\ub85c\uc368, \uac00\uc7a5 \uae30\ubcf8\uc801\uc778 \uc815\ub82c\uc785\ub2c8\ub2e4. \uc989, \ud06c\uae30\uc5d0 \ub530\ub77c\uc11c \uc815\ub82c\uc744 \ud574\uc90d\ub2c8\ub2e4. \ubb38\uc790\uc5f4\uc758 \uacbd\uc6b0\ub294 \u3131\u3134\u3137, abc\uc5d0 \ub530\ub77c\uc11c \ub4a4\ub85c \uac08\uc218\ub85d \ud070 \uac83\uc73c\ub85c \uac04\uc8fc\ud569\ub2c8\ub2e4. \uadf8\ub9ac\uace0 abc\uc640 abcd\ucc98\ub7fc \uc55e\uc774 \uac19\uace0, \ub4a4\uc5d0 \ucc28\uc774\uac00 \uc788\uc73c\uba74, \ub354 \uae34 \ubb38\uc790\uc5f4\uc774 \ud070 \uac12\uc73c\ub85c \uac04\uc8fc\ub429\ub2c8\ub2e4.<\/p>\n\n\n\n
List \ud074\ub798\uc2a4 \uc548\uc5d0\ub294 \uc124\uba85\ud55c \uac83\ubcf4\ub2e4 \ub354 \ub9ce\uace0 \ub2e4\uc591\ud55c \uae30\ub2a5\uc774 \ud3ec\ud568\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4. \ubc18\ub4dc\uc2dc Dart \uc5b8\uc5b4 \ud648\ud398\uc774\uc9c0\uc758 List \ud074\ub798\uc2a4 \uc124\uba85 \ub0b4\uc6a9\uc744 \ud655\uc778\ud574 \ubcf4\uae30 \ubc14\ub78d\ub2c8\ub2e4.<\/p>\n\n\n\n
\ub9c8\ubb34\ub9ac<\/h4>\n\n\n\n
\uc774 \uae00\uc5d0\uc11c\ub294 \uc544\ub9c8\ub3c4 \uac00\uc7a5 \ub9ce\uc774 \uc0ac\uc6a9\ub418\ub294 \ub370\uc774\ud0c0 \ud0c0\uc785 \uc911 \ud558\ub098\uc778 List\uc5d0 \ub300\ud574\uc11c \uc54c\uc544 \ubcf4\uc558\uc2b5\ub2c8\ub2e4. \uc77c\ubc18 \ubcc0\uc218\ub97c \ub9cc\ub4e4\ub4ef\uc774 type inference \uae30\ub2a5\uc744 \ud1b5\ud574\uc11c List\ub97c \ub9cc\ub4e4\uc218\ub3c4 \uc788\uace0, \uad6c\uccb4\uc801\uc73c\ub85c \ub2e4\ub8f0 \ub370\uc774\ud0c0 \ud0c0\uc785\uc744 \uc9c0\uc815\ud558\ub294 generic \ubc29\ubc95\ub3c4 \ubc30\uc6e0\uc2b5\ub2c8\ub2e4. \uadf8\ub9ac\uace0 \uba64\ubc84 property\uc640 method \ub4e4\uc5d0 \ub300\ud574\uc11c\ub3c4 \ubc30\uc6e0\uc2b5\ub2c8\ub2e4. List\ub294 \uc544\uc8fc \uc694\uae34\ud558\uac8c \uc0ac\uc6a9\ud558\ub294 \ub370\uc774\ud0c0 \ud0c0\uc785\uc774\ub2c8, \ud65c\uc6a9\ubc95\uc744 \uc798 \uc774\ud574\ud574\uc11c \uc0ac\uc6a9\ud558\uae30 \ubc14\ub78d\ub2c8\ub2e4.<\/p>\n\n\n\n
\"\"<\/figure><\/div>\n\n\n\n
Creative Commons License<\/strong> (CC BY-NC-ND<\/strong>)<\/p>\n","protected":false},"excerpt":{"rendered":"
< Dart \uae30\ucd08\ubb38\ubc95 – List > List\ub294 \uac19\uc740 \ud0c0\uc785 \ud639\uc740 \uc11c\ub85c \ub2e4\ub978 \ud0c0\uc785\uc758 \ub370\uc774\ud0c0\ub97c \ubcf5\uc218 \uac1c \uc800\uc7a5\ud558\ub294\ub370 \ub9e4\uc6b0 \uc720\uc6a9\ud55c \ub370\uc774\ud0c0 \ud0c0\uc785\ub2c8\ub2e4. List\ub294 \ub300\ubd80\ubd84\uc758 \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\uc5d0\uc11c \uc9c0\uc6d0\ud558\uba70, \ubc30\uc5f4(Array)\ub77c\uace0\ub3c4 \ubd88\ub9bd\ub2c8\ub2e4. List Creation …<\/p>\n","protected":false},"author":1,"featured_media":955,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"categories":[3],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"http:\/\/mobilelab.khu.ac.kr\/wordpress\/wp-json\/wp\/v2\/posts\/449"}],"collection":[{"href":"http:\/\/mobilelab.khu.ac.kr\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/mobilelab.khu.ac.kr\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/mobilelab.khu.ac.kr\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/mobilelab.khu.ac.kr\/wordpress\/wp-json\/wp\/v2\/comments?post=449"}],"version-history":[{"count":8,"href":"http:\/\/mobilelab.khu.ac.kr\/wordpress\/wp-json\/wp\/v2\/posts\/449\/revisions"}],"predecessor-version":[{"id":1455,"href":"http:\/\/mobilelab.khu.ac.kr\/wordpress\/wp-json\/wp\/v2\/posts\/449\/revisions\/1455"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/mobilelab.khu.ac.kr\/wordpress\/wp-json\/wp\/v2\/media\/955"}],"wp:attachment":[{"href":"http:\/\/mobilelab.khu.ac.kr\/wordpress\/wp-json\/wp\/v2\/media?parent=449"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/mobilelab.khu.ac.kr\/wordpress\/wp-json\/wp\/v2\/categories?post=449"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/mobilelab.khu.ac.kr\/wordpress\/wp-json\/wp\/v2\/tags?post=449"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}