The life of TB

// Why Is Exception Handling Needed? // Exceptions provide the means to separate the details of // what to do when something out of the ordinary happens // from the main logic of a program. // Therefore, exceptions must be handled to prevent // the application from unexpected termination. // Here are some reasons why exception handling is necessary: // To avoid abnormal termination of the progra..

Dart 2024. 1. 5. 20:40

void main(List args) { Map m1 = {}; m1[1] = 'red'; m1[2] = 'green'; m1[3] = 'blue'; print(m1.values.last); // Map은 중복 키를 허용하지 않기 때문에 // 내용 교체하려면 삭제 후 추가를 해야 한다. // 그래서 .update 메서드를 제공한다. m1.update(3, (value) => 'black', ifAbsent:() => 'newColor'); m1.update(4, (value) => 'black', ifAbsent:() => 'newColor'); print(m1); } // 결과 blue {1: red, 2: green, 3: black, 4: newColor} void main(List args) { ..

Dart 2024. 1. 5. 13:47

void main(List args) { var uniqueNums = {1, 1, 2, 2, 3, 3, 4, 5}; print(uniqueNums); print(uniqueNums.contains(1)); // Difference In Set Set fruits1 = {"Apple", "Orange", "Mango"}; Set fruits2 = {"Apple", "Grapes", "Banana"}; final differenceSet = fruits1.difference(fruits2); print(differenceSet); // Intersection Method In Dart Set fruits3 = {"Apple", "Orange", "Mango"}; Set fruits4 = {"Apple", ..

Dart 2024. 1. 4. 22:08

// Constructor In Abstract Class // // Key Points To Remember // // You can’t create an object of an abstract class. // It can have both abstract and non-abstract methods. // It is used to define the behavior of a class that other classes can inherit. // Abstract method only has a signature and no implementation. // Note: Most of the time, abstract class is used instead of concrete class to decl..

Dart 2024. 1. 4. 09:10

// Dart – Finding Minimum and Maximum Value in a List import 'dart:math'; class Ints { final int value; Ints(this.value); } void main() { List myList = [121, 12, 33, 14, 3]; int largestMyValue = myList[0]; int smallestMyValue = myList[0]; // using for-loop for (int i = 0; i largestMyValue) { largestMyValue = myList[i]; } if (myList[i] < smallestMyValue) { ..

Dart 2023. 12. 21. 18:00

int sum(int x, int y) { return x + y; } // 익명함수 var total = (int x, int y) => x + y; void main(List args) { // 함수도 객체라서 변수에 할당 가능 (first class object) var result = sum(1, 2); print("sum: $result"); // 다트 공식 문서에는 익명 함수를 람다 또는 클로저라고 부른다. print("total: ${total(1, 2)}"); print("--------------------------------------------------"); print("sum is $sum.runtimeType"); print("total is $total.runtimeType"..

Dart 2023. 12. 18. 20:00

import 'dart:io'; void main() { var li = [3, 2, 1]; print("[1] first is ${li.first}"); print("[2] last is ${li.last}"); li.insert(0, 4); print("[3] after add one value: $li"); li.sort((a, b) => a.compareTo(b)); print("[4] sorted list is $li"); // empty 생성자를 사용해 빈 리스트 생성 final myList = List.empty(growable: true); myList.addAll([5, 6, 7]); print("[5] growable list is $myList"); myList.remove(7); p..

Dart 2023. 12. 6. 14:25

void main(List args) { const items = [1, 2, 3, 4, 5]; for (int i in items) { if (i % 2 == 0) { print("[01] 숫자 $i는 짝수"); } } print('--------------------------------------------------'); items.where((element) => element % 2 == 0).map((e) => "[02] 숫자 $e는 짝수").forEach(print); } // 결과 [01] 숫자 2는 짝수 [01] 숫자 4는 짝수 -------------------------------------------------- [02] 숫자 2는 짝수 [02] 숫자 4는 짝수 void main(..

Dart 2023. 12. 5. 17:41