Swift for-in cycle
Swift for-in loops are used to traverse all the elements in a collection, such as intervals represented by numbers, elements in an array, and characters in a string.
Grammar
Swift for-in the syntax format of the loop is as follows:
for index in var {
loop body
}
Flow chart:
Example 1
import Cocoa
for index in 1...5 {
print("\(index) multiplying by 5 is：\(index * 5)")
}
The element used for traversal in the example is a numerical range from 1 to 5 represented by the closed interval operator (…).
The output of the above program execution is as follows:
Multiplying 1 by 5 is: 5
Multiplying 2 by 5 is: 10
Multiplying 3 by 5 is: 15
Multiplying 4 by 5 is: 20
Multiplying 5 by 5 is: 25
Example 2
import Cocoa
var someInts:[Int] = [10, 20, 30]
for index in someInts {
print( "The value of index is \(index)")
}
The output of the above program execution is as follows:
The value of index is 10
The value of index is 20
The value of index is 30