if(coordinate.y ==0) && (coordinate.z ==0) {
print("along the x-axis")
}
if case(_,0,0) =coordinate{
print("along the x-axis")
}
这两段代码可以得到相同的效果。
let array: [Any] = [15, "George", 2.0]
for element in array {
switch element {
case is String:
print("Found a string") // 1 time
default:
print("Found something else") // 2 times
}
}
for element in array {
switch element {
case let text as String:
print("Found a string: \(text)") // 1 time
default:
print("Found something else") // 2 times
}
}
is 与 as
for number in 1...9 {
switch number {
case let x where x % 2 == 0:
print("even") // 4 times
default:
print("odd") // 5 times
}
}
where 用法
