AlgoCollections (RUS)
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Algorithms and collections hierarchies of C++, C#, Java and Objective-C standard libraries...
![仂仍仍亠从亳亳.
(从 亟舒仆仆)
C++
(STL)
仂仂礌仆仂亞仂
舒亰仄亠舒
亠 亰舒于亳
仂 亰仆舒亠仆亳亶
弌舒于仆亳于舒ﾑ
亰仆舒亠仆亳
弌亳舒ﾑ 亠亳
亳 舒于仆亳于舒ﾑ
亰仆舒亠仆亳
C#
(.NET Framework)
[]
std::array
Array
unordered_set
unordered_map
Obj-C
(Collections Framework) (Foundation Framework)
Array
[]
NSArray
ArrayList
LinkedList
ArrayDeque
NSMutableArray
NSPointerArray
SortedSet
SortedDictionary
TreeSet
TreeMap
NSMutableOrderedSet
Set
Dictionary
HashSet/
LinkedHashSet
HashMap/
LinkedHashMap
NSMutableSet
NSCountedSet
NSHashTable
NSMutableDictionary
NSMapTable
vector list stack List LinkedList
queue deque
Stack Queue
set
map
Java](https://image.slidesharecdn.com/algocollectionsrus-140109144829-phpapp01/85/AlgoCollections-RUS-4-320.jpg)
![亠舒亳 从仂仍仍亠从亳亶.
仆亠亠亶 C# 亳 Java
IEnumerable
Collection
Map
iterator
clear
bool Add
containsK/V
remove
remove
Count
clear
contains
ISet
put
add
ICollection
size
size
GetEnumerator
entrySet
Add
keySet
Clear
values
Contains
Remove
Queue
Set
add
IList
IDictionary
Item[i]
Item[key]
Insert
Add(key,value)
IndexOf
ContainsKey
RemoveAt
Remove(key)
element
remove()
offer
peek
poll
List
Deque
add(i,o)
SortedSet
subSet
headSet
tailSet
鍖rst
last
addF/L
get
removeF/L
set
getF/L
indexOf
offerF/L
remove(i)
peekF/L
subList
pollF/L
listIterator
SortedMap
subMap
headMap
tailMap
鍖rstKey](https://image.slidesharecdn.com/algocollectionsrus-140109144829-phpapp01/85/AlgoCollections-RUS-5-320.jpg)
![亠舒亳 从仂仍仍亠从亳亶.
亠舒仂 于 C++ (STL)
舒亠亞仂亳亳
O
X b(a); 亳 b = a;
仂亢亠 弍 于亠仍亳亠仆 仆舒 亠亟亳仆亳
I
BD
舒亢亠仆亳亠
仂亢亠 弍 从仂仗亳仂于舒仆 亳 仂亰亟舒仆 仗仂 仂弍舒亰 亳 仗仂亟仂弍亳
于亠
FW
丱舒舒从亠亳亳从舒
++a 亳 a++
仂亟亟亠亢亳于舒亠 舒于仆亠仆亳亠 仆舒 舒于亠仆于仂/仆亠舒于亠仆于仂
a == b 亳 a != b
仂亢亠 弍 舒亰仄亠仆仂于舒仆 从舒从 rvalue 亟仍 仗仂仍亠仆亳 亰仆舒亠仆亳
*a"
a->m
*a = t"
仂亢亠 弍 舒亰仄亠仆仂于舒仆 从舒从 lvalue 亟仍 亳仗仂仍亰仂于舒仆亳 仍亠于舒 仂
亰仆舒从舒 仗亳于舒亳于舒仆亳
仂亢亠 弍 仂亰亟舒仆 从仂仆从仂仂仄 仗仂-仄仂仍舒仆亳
*a++ = t
X a;
仂亢亠 弍 仄亠仆亠仆 仆舒 亠亟亳仆亳
仂亟亟亠亢亳于舒亠 舒亳仄亠亳亠从亳亠 仂仗亠舒亳亳 + 亳 -
a+n 亳 an
仂亟亟亠亢亳于舒亠 舒于仆亠仆亳 (<, >, <= 亳 >=) 仄亠亢亟 亳亠舒仂舒仄亳
a < b 亳 a <= b
仂亟亟亠亢亳于舒亠 仂仗亠舒亳亳 于亠仍亳亠仆亳 += 亳 仄亠仆亠仆亳 -=
a += n 亳 a -= n
仂亟亟亠亢亳于舒亠 舒亰仄亠仆仂于舒仆亳亠 仗仂 亳仆亟亠从
RA
X b(a);"
++a == ++b
--a 亳 a--
a[n]
仂亢亠 弍 从仂仗亳仂于舒仆 亳 亳仗仂仍亰仂于舒仆 亟仍 仗仂于仂仆仂亞仂 仂弍仂亟舒
RA Random Access iterator ! I" Input iterator!
BD" Bidirectional iterator!
O" Output iterator!
FW Forward iterator!](https://image.slidesharecdn.com/algocollectionsrus-140109144829-phpapp01/85/AlgoCollections-RUS-7-320.jpg)
![亠亠亳仍亳亠仍亳
(iterator, enumerator)
C++
for
油(auto
油it
油=
油arr.begin();
油
油
油
油
油
油it
油!=
油arr.end();
油++it)
油
{
油
油
油
油
油std::cout
油<<
油*it;
油
油
油
油
油sum
油+=
油*it;
油
}
油
//
油-足-足it,
油it+n,
油it-足n
Java
C#
var
油en
油=
油arr.GetEnumerator();
油
while
油(en.MoveNext())
油
{
油
油
油
油
油Console.Write(en.Current);
油
油
油
油
油sum
油+=
油en.Current;
油
}
油
en.Dispose();
油//
油using
Objective-C
Iterator
油it
油=
油arr.iterator();
油
id
油en
油=
油[arr
油objectEnumerator];
油
while
油(it.hasNext())
油
id
油object;
油
{
油
while
油(object
油=
油[en
油nextObject])
油
油
油
油
油int
油value
油=
油(Integer)
油it.next();
油 {
油
油
油
油
油System.out.print(value);
油
油
油
油
油NSLog(@"%@",
油object);
油
油
油
油
油sum
油+=
油value;
油
油
油
油
油sum
油+=
油[object
油intValue];
油
}
}](https://image.slidesharecdn.com/algocollectionsrus-140109144829-phpapp01/85/AlgoCollections-RUS-8-320.jpg)
![亳仄亠
(2 亳亰 6)
弌++:
"
map<int,int> countByUserId;!
for (auto it = tweets.begin(); it != tweets.end(); ++it)!
if ("2013-09-01" <= it->time && it->time < "2013-09-02")!
if (it->url != 0)!
countByUserId[it->user_id]++;!
"
auto para = max_element(countByUserId.begin(),!
countByUserId.end(),!
[](pair<int,int> a, pair<int,int> b)!
{ return a.second < b.second; });!
油!
cout << "User = " << userDict[para.first].name << endl!
<< "Value = " << para.second << endl;](https://image.slidesharecdn.com/algocollectionsrus-140109144829-phpapp01/85/AlgoCollections-RUS-12-320.jpg)
![亳仄亠
(3 亳亰 6)
Obj-C:
"
NSMutableDictionary * countByUserId = [NSMutableDictionary dictionary];!
for (Tweet * tweet in tweets)!
if ([@"2013-09-01" compareTo:tweet.time] <= 0 && [tweet.time compareTo:@"2013-09-02"] < 0)!
if (tweet.url != 0) {!
int count = [countByUserId[tweet->user_id] intValue];!
countByUserId[tweet->user_id] = @(count + 1);!
}!
"
int maxCount = 0;!
id maxKey = nil;!
[countByUserId enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {!
if ([obj intValue] > maxCount) {!
maxCount = [obj intValue];!
maxKey = key;!
}!
}];!
"
NSLog(@"User = %@nValue = %d",!
[userDict[maxKey] name],!
maxCount);](https://image.slidesharecdn.com/algocollectionsrus-140109144829-phpapp01/85/AlgoCollections-RUS-13-320.jpg)
![亳仄亠
(5 亳亰 6)
C#:
"
var group = tweets.Where(t => "2013-09-01" <= t.time!
&& t.time < "2013-09-02")!
.Where(t => t.url != null)!
.GroupBy(t => t.user_id)!
.Max(gr => gr.Count());!
油!
Console.WriteLine("User = {0}nValue = {1}",!
userDict[group.Key].name,!
group.Count());](https://image.slidesharecdn.com/algocollectionsrus-140109144829-phpapp01/85/AlgoCollections-RUS-15-320.jpg)
![亳仄亠
(7 亳亰 6, 舒亞舒)
Obj-C + NSEnumeratorLinq:
"
var para = [[[[tweets.objectEnumerator!
where:^(Tweet *t){return [@"2013-09-01" compareTo:t.time] <= 0!
&& [t.time compareTo:@"2013-09-02"] < 0;}]!
where:^(Tweet *t){return t.url != null;}]!
groupBy:^(Tweet *t){return t.user_id;}]!
max:^(NSKeyValuePair *p){return @([p.value count]);}];!
油!
NSLog(@"User = %@nValue = %@",!
[userDict[para.key] name],!
[para.value count]);](https://image.slidesharecdn.com/algocollectionsrus-140109144829-phpapp01/85/AlgoCollections-RUS-17-320.jpg)
![弌舒于仆亠仆亳亠 舒亳亠从
舒仆亟舒仆 弍亳弍仍亳仂亠从
弌++:
亠舒亳 亳亠舒仂仂于
仍亞仂亳仄 仆亳于亠舒仍仆亠, 亰舒于亳 仂 从舒亠亞仂亳亶 亳亠舒仂仂于
弌#:
亠舒亳 亳仆亠亠亶仂于
仍亞仂亳仄 仆亳于亠舒仍仆亠, 亰舒于亳 仂 亳仆亠亠亶仂于, 于舒亳于舒ﾑ 于 亠仗
Java:
亠舒亳 亳仆亠亠亶仂于
仍亞仂亳仄 仆亳于亠舒仍仆亠, 亰舒于亳 仂 亳仆亠亠亶仂于 (java.util.Collections)
仍亞亳仄 仆亳于亠舒仍仆亠, 于舒亳于舒ﾑ 于 亠仗 (java.util.stream)
Obj-C:
亠舒亳 仂于亠, 亠仍亳 仆亠 亳舒 Immutable-Mutable
仍亞仂亳仄 仗亠亳亳仆亠 从仂仄亠 仂亟仆仂亞仂 :) [NSEnumerator allObjects]](https://image.slidesharecdn.com/algocollectionsrus-140109144829-phpapp01/85/AlgoCollections-RUS-18-320.jpg)
![One more thing
仗亠舒仂 if-null
仂亟 仆舒 C#:
string priceStr = priceHolder.get(featureName);
PriceLabel.Text = priceStr ?? "$0.99";
仂亟 仆舒 Obj-C:
NSDictionary *prices = [self.storeManager pricesDictionary];
NSString *p1 = prices[@"com.identifier1"] ?: @"$0.99";](https://image.slidesharecdn.com/algocollectionsrus-140109144829-phpapp01/85/AlgoCollections-RUS-21-320.jpg)
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- 1. 仍亞仂亳仄 亳 从仂仍仍亠从亳亳 舒仆亟舒仆 弍亳弍仍亳仂亠从 C++, C#, Java, Objective-C 弍 仂亟仆仂亶 亢亠仄亢亳仆亠 Microsoft, 仗仂亳仂于舒仆仆仂亶 仆舒 Obj-C... 仆仂仆 从仂于 @k06a
- 3. 仆仂于仆亠 仆仂亳 舒仆亟舒仆仂亶 弍亳弍仍亳仂亠从亳 仂仍仍亠从亳亳 (从 亟舒仆仆) 仍亞仂亳仄 (仆亳于亠舒仍仆亠 亳 仗亠亳舒仍仆亠) 亠亠亳仍亳亠仍亳 (iterator, enumerator)
- 4. 仂仍仍亠从亳亳. (从 亟舒仆仆) C++ (STL) 仂仂礌仆仂亞仂 舒亰仄亠舒 亠 亰舒于亳 仂 亰仆舒亠仆亳亶 弌舒于仆亳于舒ﾑ 亰仆舒亠仆亳 弌亳舒ﾑ 亠亳 亳 舒于仆亳于舒ﾑ 亰仆舒亠仆亳 C# (.NET Framework) [] std::array Array unordered_set unordered_map Obj-C (Collections Framework) (Foundation Framework) Array [] NSArray ArrayList LinkedList ArrayDeque NSMutableArray NSPointerArray SortedSet SortedDictionary TreeSet TreeMap NSMutableOrderedSet Set Dictionary HashSet/ LinkedHashSet HashMap/ LinkedHashMap NSMutableSet NSCountedSet NSHashTable NSMutableDictionary NSMapTable vector list stack List LinkedList queue deque Stack Queue set map Java
- 5. 亠舒亳 从仂仍仍亠从亳亶. 仆亠亠亶 C# 亳 Java IEnumerable Collection Map iterator clear bool Add containsK/V remove remove Count clear contains ISet put add ICollection size size GetEnumerator entrySet Add keySet Clear values Contains Remove Queue Set add IList IDictionary Item[i] Item[key] Insert Add(key,value) IndexOf ContainsKey RemoveAt Remove(key) element remove() offer peek poll List Deque add(i,o) SortedSet subSet headSet tailSet 鍖rst last addF/L get removeF/L set getF/L indexOf offerF/L remove(i) peekF/L subList pollF/L listIterator SortedMap subMap headMap tailMap 鍖rstKey
- 6. NSArray Input iterator Output iterator Forward iterator NSSet NSMutableArray NSMutableSet NSPointerArray NSCountedSet NSHashTable 亠舒亳 从仂仍仍亠从亳亶. C++ 亳 Obj-C NSOrderedSet Bidirectional iterator Random Access iterator NSDictionary NSMutableDictionary NSMapTable NSMutableOrderedSet NSIndexSet NSMutableIndexSet
- 7. 亠舒亳 从仂仍仍亠从亳亶. 亠舒仂 于 C++ (STL) 舒亠亞仂亳亳 O X b(a); 亳 b = a; 仂亢亠 弍 于亠仍亳亠仆 仆舒 亠亟亳仆亳 I BD 舒亢亠仆亳亠 仂亢亠 弍 从仂仗亳仂于舒仆 亳 仂亰亟舒仆 仗仂 仂弍舒亰 亳 仗仂亟仂弍亳 于亠 FW 丱舒舒从亠亳亳从舒 ++a 亳 a++ 仂亟亟亠亢亳于舒亠 舒于仆亠仆亳亠 仆舒 舒于亠仆于仂/仆亠舒于亠仆于仂 a == b 亳 a != b 仂亢亠 弍 舒亰仄亠仆仂于舒仆 从舒从 rvalue 亟仍 仗仂仍亠仆亳 亰仆舒亠仆亳 *a" a->m *a = t" 仂亢亠 弍 舒亰仄亠仆仂于舒仆 从舒从 lvalue 亟仍 亳仗仂仍亰仂于舒仆亳 仍亠于舒 仂 亰仆舒从舒 仗亳于舒亳于舒仆亳 仂亢亠 弍 仂亰亟舒仆 从仂仆从仂仂仄 仗仂-仄仂仍舒仆亳 *a++ = t X a; 仂亢亠 弍 仄亠仆亠仆 仆舒 亠亟亳仆亳 仂亟亟亠亢亳于舒亠 舒亳仄亠亳亠从亳亠 仂仗亠舒亳亳 + 亳 - a+n 亳 an 仂亟亟亠亢亳于舒亠 舒于仆亠仆亳 (<, >, <= 亳 >=) 仄亠亢亟 亳亠舒仂舒仄亳 a < b 亳 a <= b 仂亟亟亠亢亳于舒亠 仂仗亠舒亳亳 于亠仍亳亠仆亳 += 亳 仄亠仆亠仆亳 -= a += n 亳 a -= n 仂亟亟亠亢亳于舒亠 舒亰仄亠仆仂于舒仆亳亠 仗仂 亳仆亟亠从 RA X b(a);" ++a == ++b --a 亳 a-- a[n] 仂亢亠 弍 从仂仗亳仂于舒仆 亳 亳仗仂仍亰仂于舒仆 亟仍 仗仂于仂仆仂亞仂 仂弍仂亟舒 RA Random Access iterator ! I" Input iterator! BD" Bidirectional iterator! O" Output iterator! FW Forward iterator!
- 8. 亠亠亳仍亳亠仍亳 (iterator, enumerator) C++ for 油(auto 油it 油= 油arr.begin(); 油 油 油 油 油 油it 油!= 油arr.end(); 油++it) 油 { 油 油 油 油 油std::cout 油<< 油*it; 油 油 油 油 油sum 油+= 油*it; 油 } 油 // 油-足-足it, 油it+n, 油it-足n Java C# var 油en 油= 油arr.GetEnumerator(); 油 while 油(en.MoveNext()) 油 { 油 油 油 油 油Console.Write(en.Current); 油 油 油 油 油sum 油+= 油en.Current; 油 } 油 en.Dispose(); 油// 油using Objective-C Iterator 油it 油= 油arr.iterator(); 油 id 油en 油= 油[arr 油objectEnumerator]; 油 while 油(it.hasNext()) 油 id 油object; 油 { 油 while 油(object 油= 油[en 油nextObject]) 油 油 油 油 油int 油value 油= 油(Integer) 油it.next(); 油 { 油 油 油 油 油System.out.print(value); 油 油 油 油 油NSLog(@"%@", 油object); 油 油 油 油 油sum 油+= 油value; 油 油 油 油 油sum 油+= 油[object 油intValue]; 油 } }
- 9. 仍亞仂亳仄 (1 亳亰 2) C++ (STL) 舒弍仂舒 仄仆仂亢亠于舒仄亳 C# (.NET Framework) merge set_union Union Intersect set_intersect Except set_difference Java Obj-C (Collections Framework) (Foundation Framework) disjoint unionSet minusSet intersectSet removeObjectsInArray sortedArray* keysSortedBy* sort stable_sort partial_sort OrderBy ThenBy OrderByDescending ThenByDescending sort sorted 鍖nd search binary_search List.BinarySearch List.Find*** IList.IndexOf Where TakeWhile SkipWhile binarySearch indexOfSubList 鍖lter all_of any_of 亞亞亠舒亞亳ﾑ亳亠 none_of count min max All Any Count Sum Average Min Max valueForKeyPath frequency @avg @count min max allMatch anyMatch reduce @max @min noneMatch @sum 弌仂亳仂于从亳 仂亳从仂于亠 indexOfObject* 鍖lterUsing 鍖ltered*Using objectsPassingTest NSPredicate NSExpression
- 10. 仍亞仂亳仄 (2 亳亰 2) C++ (STL) 仂亳亠 C# (.NET Framework) copy swap transform replace 鍖ll generate remove unique reverse rotate shuf鍖e List.Reverse Select Take Skip Enumerable.Repeat Enumerable.Range Distinct Reverse Join GroupBy SelectMany Java Obj-C (Collections Framework) (Foundation Framework) copy swap replaceAll 鍖ll reverse rotate shuf鍖e @distinctUnionOfObjects @unionOfObjects @distinctUnionOfArrays @unionOfArrays @unionOfSets
- 11. 亳仄亠 (1 亳亰 6) 舒仆仂: struct Tweet { id, time, text, url, user_id }; struct User { id, name, nick }; array<Tweet> tweets; map<int,User> userDict; 舒亶亳: 仄 仗仂仍亰仂于舒亠仍 仄舒从亳仄舒仍仆仄 亳仍仂仄 于亳仂于 亰舒 亳从亳仂于舒仆仆 亟舒 (1 亠仆 2013), 仂亟亠亢舒亳 仍从 于 仗仂仍亠 url 亳 舒仄仂 从仂仍亳亠于仂 舒从亳 于亳仂于.
- 12. 亳仄亠 (2 亳亰 6) 弌++: " map<int,int> countByUserId;! for (auto it = tweets.begin(); it != tweets.end(); ++it)! if ("2013-09-01" <= it->time && it->time < "2013-09-02")! if (it->url != 0)! countByUserId[it->user_id]++;! " auto para = max_element(countByUserId.begin(),! countByUserId.end(),! [](pair<int,int> a, pair<int,int> b)! { return a.second < b.second; });! 油! cout << "User = " << userDict[para.first].name << endl! << "Value = " << para.second << endl;
- 13. 亳仄亠 (3 亳亰 6) Obj-C: " NSMutableDictionary * countByUserId = [NSMutableDictionary dictionary];! for (Tweet * tweet in tweets)! if ([@"2013-09-01" compareTo:tweet.time] <= 0 && [tweet.time compareTo:@"2013-09-02"] < 0)! if (tweet.url != 0) {! int count = [countByUserId[tweet->user_id] intValue];! countByUserId[tweet->user_id] = @(count + 1);! }! " int maxCount = 0;! id maxKey = nil;! [countByUserId enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {! if ([obj intValue] > maxCount) {! maxCount = [obj intValue];! maxKey = key;! }! }];! " NSLog(@"User = %@nValue = %d",! [userDict[maxKey] name],! maxCount);
- 14. 亳仄亠 (4 亳亰 6) Java: " HashMap<int,int> countByUserId = new HashMap<int,int>();! for (Tweet tweet : tweets)! if ("2013-09-01" <= tweet.time && tweet.time < "2013-09-02")! if (tweet.url != 0) {! int count = countByUserId.get(tweet.user_id);! countByUserId.set(tweet->user_id, (count==null?0:count) + 1);! }! 油! int maxCount = 0;! id maxKey = nil;! for(Entry<int,int> entry : countByUserId.entrySet()) {! if (entry.getValue() > maxCount) {! maxCount = entry.getValue();! maxKey = entry.getKey();! }! }! 油! System.out.format("User = %snValue = %d",! userDict.get(maxKey),! maxCount);
- 15. 亳仄亠 (5 亳亰 6) C#: " var group = tweets.Where(t => "2013-09-01" <= t.time! && t.time < "2013-09-02")! .Where(t => t.url != null)! .GroupBy(t => t.user_id)! .Max(gr => gr.Count());! 油! Console.WriteLine("User = {0}nValue = {1}",! userDict[group.Key].name,! group.Count());
- 16. 亳仄亠 (6 亳亰 6) Java 8 (java.util.stream): " Entry<int,List<int>> ! entry = tweets.stream()! .filter(t -> "2013-09-01" <= t.time! && t.time < "2013-09-02")! .filter(t -> t.url != null)! .groupingBy(t -> t.user_id) // Map<int,List<int>>! .entrySet().stream()! .max((a,b) -> Int.compare(a.getValue().size(),! b.getValue().size()));! 油! System.out.format("User = %snValue = %d",! userDict.get(entry.getKey()),! entry.getValue().size());
- 17. 亳仄亠 (7 亳亰 6, 舒亞舒) Obj-C + NSEnumeratorLinq: " var para = [[[[tweets.objectEnumerator! where:^(Tweet *t){return [@"2013-09-01" compareTo:t.time] <= 0! && [t.time compareTo:@"2013-09-02"] < 0;}]! where:^(Tweet *t){return t.url != null;}]! groupBy:^(Tweet *t){return t.user_id;}]! max:^(NSKeyValuePair *p){return @([p.value count]);}];! 油! NSLog(@"User = %@nValue = %@",! [userDict[para.key] name],! [para.value count]);
- 18. 弌舒于仆亠仆亳亠 舒亳亠从 舒仆亟舒仆 弍亳弍仍亳仂亠从 弌++: 亠舒亳 亳亠舒仂仂于 仍亞仂亳仄 仆亳于亠舒仍仆亠, 亰舒于亳 仂 从舒亠亞仂亳亶 亳亠舒仂仂于 弌#: 亠舒亳 亳仆亠亠亶仂于 仍亞仂亳仄 仆亳于亠舒仍仆亠, 亰舒于亳 仂 亳仆亠亠亶仂于, 于舒亳于舒ﾑ 于 亠仗 Java: 亠舒亳 亳仆亠亠亶仂于 仍亞仂亳仄 仆亳于亠舒仍仆亠, 亰舒于亳 仂 亳仆亠亠亶仂于 (java.util.Collections) 仍亞亳仄 仆亳于亠舒仍仆亠, 于舒亳于舒ﾑ 于 亠仗 (java.util.stream) Obj-C: 亠舒亳 仂于亠, 亠仍亳 仆亠 亳舒 Immutable-Mutable 仍亞仂亳仄 仗亠亳亳仆亠 从仂仄亠 仂亟仆仂亞仂 :) [NSEnumerator allObjects]
- 19. NSEnumeratorLinq 仆仂于仆亠 仄亠仂亟: 舒弍仂舒 仄仆仂亢亠于舒仄亳: where, where_i, ofType concat, concatOne select, select_i union, intersect, except distinct zip skip, skipWhile join, groupJoin take, takeWhile groupBy, selectMany orderBy, orderByDescending 亅从仗仂: 从从仄仍亳: toArray, toSet toDictionary, toLookup 仂仗仂仍仆亳亠仍仆仂: aggregate, elect, elementAt all, any, none readBytes, readLines min, max keyValueEnumerator sum, average stringByJoin-withSeparator 鍖rstOrDefault, lastOrDefault enumerateCharacters
- 20. 仂仍亠亰仆亠 仍从亳 Collections Programming Guide - https://developer.apple.com/ library/mac/documentation/cocoa/conceptual/Collections/ Collections.html NSSortDescriptor - http://nshipster.com/nssortdescriptor/ NSPredicate - http://nshipster.com/nspredicate/ NSExpression - http://nshipster.com/nsexpression/ NSOrderedSet - http://nshipster.com/nsorderedset/ Key-Value Collection Operators https://developer.apple.com/ library/mac/documentation/Cocoa/Conceptual/KeyValueCoding/ Articles/CollectionOperators.html https://github.com/robrix/RxCollections https://github.com/k06a/NSEnumeratorLinq
- 21. One more thing 仗亠舒仂 if-null 仂亟 仆舒 C#: string priceStr = priceHolder.get(featureName); PriceLabel.Text = priceStr ?? "$0.99"; 仂亟 仆舒 Obj-C: NSDictionary *prices = [self.storeManager pricesDictionary]; NSString *p1 = prices[@"com.identifier1"] ?: @"$0.99";