void main(List<String> args) {
var uniqueNums = {1, 1, 2, 2, 3, 3, 4, 5};
print(uniqueNums);
print(uniqueNums.contains(1));
// Difference In Set
Set<String> fruits1 = {"Apple", "Orange", "Mango"};
Set<String> fruits2 = {"Apple", "Grapes", "Banana"};
final differenceSet = fruits1.difference(fruits2);
print(differenceSet);
// Intersection Method In Dart
Set<String> fruits3 = {"Apple", "Orange", "Mango"};
Set<String> fruits4 = {"Apple", "Grapes", "Banana"};
final intersectionSet = fruits3.intersection(fruits4);
print(intersectionSet);
}
// 결과
{1, 2, 3, 4, 5}
true
{Orange, Mango}
{Apple}
void main(List<String> args) {
var uniqueNums = {1, 1, 2, 2, 3, 3, 4, 5};
print(uniqueNums);
print(uniqueNums.contains(1));
// Difference In Set
Set<String> fruits1 = {"Apple", "Orange", "Mango"};
Set<String> fruits2 = {"Apple", "Grapes", "Banana"};
final differenceSet = fruits1.difference(fruits2);
print(differenceSet);
// Intersection Method In Dart
Set<String> fruits3 = {"Apple", "Orange", "Mango"};
Set<String> fruits4 = {"Apple", "Grapes", "Banana"};
final intersectionSet = fruits3.intersection(fruits4);
print(intersectionSet);
Set<String> colors1 = {'red', 'yellow', 'blue'};
Set<String> color2 = {};
color2.add('red');
color2.add('yellow');
color2.add('blue');
Set<String> set1 = {}; // Empty Set
Set<String> set2 = {'Aa', 'Bb', 'Cc'}; // A Set with String values
var set3 = <int>{}; // Empty Set
var set4 = <int>{2, 4, 6, 1}; // A Set with int values
var set5 = {}; // Is not a Set, set5 has type Map
print(set5.runtimeType);
// set + list
Set<String> set = {'A', 'B', 'C'};
var list = ['D', 'E'];
set.addAll(list);
print(set);
// Modifying elements
//
// Unlike a List, you cannot directly change elements in a Set
// because each element must remain unique.
// If you want to update an element,
// you need to remove the old one and add the new value.
}
// 결과
{1, 2, 3, 4, 5}
true
{Orange, Mango}
{Apple}
_Map<dynamic, dynamic>
{A, B, C, D, E}
// Accessing an element by index
// Unlike a list, you cannot access an element at an index
// using square brackets [].
// Instead, you can use the elementAt() method like this:
/*
A set is a collection of unique elements. A set doesn’t maintain the order of elements.
Use the add() method to add an element to a set.
Use the addAll() method to add elements from a list to a set.
Use the remove() method to remove an element from a set.
Use the intersection() method to find the intersection of two sets.
Use the union() method to find the union of two sets.
Use the for-in to iterate over elements of a set.
*/
void main(List<String> args) {
var ratingsMap = {'one': 1, 'two': 2, 'three': 3};
print(ratingsMap.runtimeType);
var ratingsSet = {1, 2, 3};
print(ratingsSet.runtimeType);
// 같은 curly braces를 사용하는데 : 에 의한 구분이 들어 있다면 Map
// : 이 없다면 그냥 set collection 이다.
print("first: ${ratingsSet.elementAt(0)}");
print("second: ${ratingsSet.elementAt(1)}");
print("third: ${ratingsSet.elementAt(2)}");
// Checking the existence of elements
print(ratingsSet.contains(1));
}
// 결과
_Map<String, int>
_Set<int>
first: 1
second: 2
third: 3
true
void main(List<String> args) {
var c = {1, 3}.union({3, 5}); // {1, 3, 5}
var d = {1, 3}.intersection({3, 5}); // {3}
print(c);
print(d);
var result = c.difference(d); // {1, 5}
print(result);
}
// 결과
{1, 3, 5}
{3}
{1, 5}
void main(List<String> args) {
var euLangs = {'Russian', 'German', 'French', 'English'};
print(euLangs.elementAt(2));
print(euLangs.length);
var afLangs = {'Swahili', 'Zulu', 'Arabic', 'French'};
print(afLangs.union(euLangs)); // 합집합
print(afLangs.intersection(euLangs)); // 교집합
print(afLangs.difference(euLangs)); // 차집합
}
// 결과
French
4
{Swahili, Zulu, Arabic, French, Russian, German, English}
{French}
{Swahili, Zulu, Arabic}
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