[转]Swift中的标准函数

1 abs(-1) == 1 
2 abs(-42) == 42 
3 abs(42) == 42 

1 var languages = ["Swift", "Objective-C"] 
2 contains(languages, "Swift") == true 
3 contains(languages, "Java") == false 
4 contains([29, 85, 42, 96, 75], 42) == true 

 1 var languages = ["Swift", "Objective-C"] 
 2 
 3 dump(languages) 
 4 
 5 // Prints: 
 6 
 7 // ? 2 elements 
 8 
 9 // - [0]: Swift 
10 
11 // - [1]: Objective-C 

1 var languages = ["Swift", "Objective-C"] 
2 
3 equal(languages, ["Swift", "Objective-C"]) == true 
4 
5 var oldLanguages = dropFirst(languages) 
6 
7 equal(oldLanguages, ["Objective-C"]) == true 

 1 for i in filter(1...100, { $0 % 10 == 0 }) 
 2 
 3 { 
 4 
 5 // 10, 20, 30, ... 
 6 
 7     println(i) 
 8 
 9     assert(contains([10, 20, 30, 40, 50, 60, 70, 80, 90, 100], i)) 
10 
11 } 

1 var languages = ["Swift", "Objective-C"] 
2 
3 find(languages, "Objective-C") == 1 
4 
5 find(languages, "Java") == nil 
6 
7 find([29, 85, 42, 96, 75], 42) == 2 

1 equal(indices([29, 85, 42]), [0, 1, 2]) 
2 for i in indices([29, 85, 42]) { 
3 
4 // 0, 1, 2 
5 
6     println(i) 
7 
8 } 

1 join(":", ["A", "B", "C"]) == "A:B:C" 
2 
3 var languages = ["Swift", "Objective-C"] 
4 
5 join("/", languages) == "Swift/Objective-C" 

 1 equal(map(1...3, { $0 * 5 }), [5, 10, 15]) 
 2 for i in map(1...10, { $0 * 10 }) { 
 3 
 4 // 10, 20, 30, ... 
 5 
 6     println(i) 
 7 
 8     assert(contains([10, 20, 30, 40, 50, 60, 70, 80, 90, 100], i)) 
 9 
10 } 

1 max(0, 1) == 1 
2 max(8, 2, 3) == 8 

1 maxElement(1...10) == 10 
2 var languages = ["Swift", "Objective-C"] 
3 
4 maxElement(languages) == "Swift" 

1 minElement(1...10) == 1 
2 var languages = ["Swift", "Objective-C"] 
3 
4 minElement(languages) == "Objective-C" 

1 var languages = ["Swift", "Objective-C"] 
2 
3 reduce(languages, "", { $0 + $1 }) == "SwiftObjective-C" 
4 
5 reduce([10, 20, 5], 1, { $0 * $1 }) == 1000 

1 equal(reverse([1, 2, 3]), [3, 2, 1]) 
2 for i in reverse([1, 2, 3]) { 
3 
4 // 3, 2, 1 
5 
6     println(i) 
7 
8 } 

1 startsWith("foobar", "foo") == true 
2 
3 startsWith(10..100, 10..15) == true 
4 
5 var languages = ["Swift", "Objective-C"] 
6 
7 startsWith(languages, ["Swift"]) == true 

 1 abs(...) 
 2 advance(...) 
 3 alignof(...) 
 4 alignofValue(...) 
 5 assert(...) 
 6 bridgeFromObjectiveC(...) 
 7 bridgeFromObjectiveCUnconditional(...) 
 8 bridgeToObjectiveC(...) 
 9 bridgeToObjectiveCUnconditional(...) 
10 c_malloc_size(...) 
11 c_memcpy(...) 
12 c_putchar(...) 
13 contains(...) 
14 count(...) 
15 countElements(...) 
16 countLeadingZeros(...) 
17 debugPrint(...) 
18 debugPrintln(...) 
19 distance(...) 
20 dropFirst(...) 
21 dropLast(...) 
22 dump(...) 
23 encodeBitsAsWords(...) 
24 enumerate(...) 
25 equal(...) 
26 filter(...) 
27 find(...) 
28 getBridgedObjectiveCType(...) 
29 getVaList(...) 
30 indices(...) 
31 insertionSort(...) 
32 isBridgedToObjectiveC(...) 
33 isBridgedVerbatimToObjectiveC(...) 
34 isUniquelyReferenced(...) 
35 join(...) 
36 lexicographicalCompare(...) 
37 map(...) 
38 max(...) 
39 maxElement(...) 
40 min(...) 
41 minElement(...) 
42 numericCast(...) 
43 partition(...) 
44 posix_read(...) 
45 posix_write(...) 
46 print(...) 
47 println(...) 
48 quickSort(...) 
49 reduce(...) 
50 reflect(...) 
51 reinterpretCast(...) 
52 reverse(...) 
53 roundUpToAlignment(...) 
54 sizeof(...) 
55 sizeofValue(...) 
56 sort(...) 
57 split(...) 
58 startsWith(...) 
59 strideof(...) 
60 strideofValue(...) 
61 swap(...) 
62 swift_MagicMirrorData_summaryImpl(...) 
63 swift_bufferAllocate(...) 
64 swift_keepAlive(...) 
65 toString(...) 
66 transcode(...) 
67 underestimateCount(...) 
68 unsafeReflect(...) 
69 withExtendedLifetime(...) 
70 withObjectAtPlusZero(...) 
71 withUnsafePointer(...) 
72 withUnsafePointerToObject(...) 
73 withUnsafePointers(...) 
74 withVaList(...)