mirror of
https://github.com/apple/swift.git
synced 2025-12-14 20:36:38 +01:00
5f0dcb572b
This allows to use `for-in` statement to iterate over i.e. `any Collection` and other existentials that conform to `Sequence` protocol.
64 lines
1.1 KiB
Swift
64 lines
1.1 KiB
Swift
// RUN: %target-run-simple-swift | %FileCheck %s
|
|
// REQUIRES: executable_test
|
|
|
|
// Foreach loops
|
|
|
|
print("foreach/where")
|
|
for i in 0...6 where i & 1 == 0 {
|
|
print(i)
|
|
}
|
|
|
|
// CHECK-LABEL: foreach/where
|
|
// CHECK-NEXT: 0
|
|
// CHECK-NEXT: 2
|
|
// CHECK-NEXT: 4
|
|
// CHECK-NEXT: 6
|
|
|
|
|
|
let OptionalArr : [Int?] = [1, nil, 2, nil, 3, nil, nil, nil, 4, 5]
|
|
|
|
print("foreach/case")
|
|
for case let i? in OptionalArr {
|
|
print(i)
|
|
}
|
|
|
|
// CHECK-LABEL: foreach/case
|
|
// CHECK-NEXT: 1
|
|
// CHECK-NEXT: 2
|
|
// CHECK-NEXT: 3
|
|
// CHECK-NEXT: 4
|
|
// CHECK-NEXT: 5
|
|
|
|
print("foreach/case/where")
|
|
|
|
for case let i? in OptionalArr where i != 3 {
|
|
print(i)
|
|
}
|
|
|
|
// CHECK-LABEL: foreach/case/where
|
|
// CHECK-NEXT: 1
|
|
// CHECK-NEXT: 2
|
|
// CHECK-NEXT: 4
|
|
// CHECK-NEXT: 5
|
|
|
|
print("guard top level")
|
|
guard let guardvalue = Optional(42) else { preconditionFailure() }
|
|
print(guardvalue)
|
|
|
|
// CHECK-LABEL: guard top level
|
|
// CHECK-NEXT: 42
|
|
|
|
print("done");
|
|
// CHECK-LABEL: done
|
|
|
|
func testAnyCollection(_ c: any Collection) {
|
|
for v in c {
|
|
print(v)
|
|
}
|
|
}
|
|
|
|
testAnyCollection([1, 2.0, "Hello"])
|
|
// CHECK-NEXT: 1
|
|
// CHECK-NEXT: 2.0
|
|
// CHECK-NEXT: Hello
|