1.List
Common attributes:
length length
Flip reversed
Whether isEmpty empty
Whether isNotEmpty not empty
Common methods:
Add to add
addAll splicing array
indexOf to find specific values passed
remove delete specific values passed
removeAt delete incoming index value
fillRange modification
insert (index, value); inserting specified position
insertAll (index, list) specified position inserted List
toList () is converted into other types of List
join () List into a string
split () is converted into String List
forEach
map
where
any
every
1) List the inside of the property
main void () {
// List no properties:
List myList = [ 'banana', 'apple', 'watermelon'];
Print (myList.length);
Print (myList.isEmpty);
Print (myList.isNotEmpty);
print (myList.reversed); // reverse sort the list, output tuples
var newMyList myList.reversed.toList = ();
Print (newMyList);
}
2) List inside approach:
main void () {
List myList = [ 'banana', 'apple', 'watermelon'];
myList.add ( 'peach'); // data increases by increasing a
myList.addAll ([ 'peach', 'grapes'] ); // array of splicing
Print (myList);
Print (myList.indexOf ( 'apple fruit x')); // Find the indexOf lookup data is less than -1 returns the index to find
myList.remove ( 'watermelon');
myList.removeAt (. 1);
Print (myList);
}
main void () {
List myList = [ 'banana', 'apple', 'watermelon'];
myList.fillRange (. 1,. 3 'AAA'); // Modify
Print (myList)
}
main void () {
List myList = [ 'banana', 'apple', 'watermelon'];
myList.insert (. 1, 'AAA'); // insert a
myList.insertAll (1, [ 'aaa' , 'bbb ']); // insert plurality
Print (myList);
}
main void () {
List myList = [ 'banana', 'apple', 'watermelon'];
var = myList.join STR ( '-'); // List converted to a string
Print (STR);
Print (STR IS String); // to true
}
main void () {
var STR = 'Banana - Apple - watermelon';
var = str.split List ( '-'); // convert the string into List
Print (List);
Print (List List IS); // Ture
}
2.Set
main void () {
var new new the Set S = ();
s.add ( 'banana');
s.add ( 'apple');
s.add ( 'apple');
Print (S); // {bananas, Apple}
Print (s.toList ());
}
main void () {
List myList = [ 'banana', 'apple', 'watermelon', 'banana', 'apple', 'banana', 'apple'];
var new new the Set S = ();
s.addAll ( myList);
Print (S);
Print (s.toList ());
}
3.Maps
Map (Maps) are unordered key-value pairs:
Common attributes:
keys to get all the key values
Get all values of the value value
Whether isEmpty empty
Whether isNotEmpty not empty
Common methods:
remove (key) to delete the specified key data
addAll ({...}) mapped to the combined properties of increased mapping
Value in the map view containsValue Returns true / false
forEach
map
where
any
every
1). Common Properties
void main(){
Map person={
"name":"张三",
"age":20,
"sex":"男"
};
print(person.keys.toList()); //[name, age, sex]
print(person.values.toList()); //[张三, 20, 男]
print(person.isEmpty); //false
print(person.isNotEmpty); //true
}
2). The method used
void main(){
Map person={
"name":"张三",
"age":20,
"sex":"男"
};
person.addAll({
"work":['敲代码','送外卖'],
"height":160
});
print(person);
person.remove("sex");
print(person);
print(person.containsValue('张三'));
}
}
3.forEach map where any every
1)forEach
Loop element
main void () {
List myList = [ 'banana', 'apple', 'watermelon'];
for (var I = 0; I <myList.length; I ++) {
Print (myList [I]);
}
}
main void () {
List myList = [ 'banana', 'apple', 'watermelon'];
for (var Item in myList) {
Print (Item);
}
}
main void () {
List myList = [ 'banana', 'apple', 'watermelon'];
// myList.forEach ((Key, value) {
// Print ( 'Key $ --- $ value');
/ /});
myList.forEach ((value) {
Print ( "$ value");
});
}
2)map
Modify the array of data map
void main(){
List myList=[1,3,4];
List newList=new List();
for(var i=0;i<myList.length;i++){
newList.add(myList[i]*2);
}
print(newList); //[2, 6, 8]
List myList=[1,3,4];
var newList=myList.map((value){
return value*2;
});
print(newList.toList()); //[2, 6, 8]
}
3)where
Find Array
void main(){
List myList=[1,3,4,5,7,8,9];
var newList=myList.where((value){
return value>5;
});
print(newList.toList()); //[7, 8, 9]
}
4）any
As long as the condition returns true
main void () {
List myList = [1,3,4,5,7,8,9];
var myList.any F = ((value) {// set as long as there are satisfied the conditions return to true
return value> . 5;
});
Print (F); // to true
}
5)every
Each of which satisfies the condition returns true, false otherwise
main void () {
List myList = [1,3,4,5,7,8,9];
each var f = myList.every ((value) {// returns true condition is satisfied otherwise to false
return value> . 5;
});
Print (F); // to false
}
For Set
void main(){
var s=new Set();
s.addAll([1,222,333]);
s.forEach((value)=>print(value));
}
For map
void main(){
Map person={
"name":"张三",
"age":20
};
person.forEach((key,value){
print("$key---$value");
});
}