Swift Swift Flow chart: 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: The output of the above program execution is as follows: 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. 9.17.1. Grammar #
for-in the syntax format of the loop is as follows:for index in var { loop body }
9.17.2. Example 1 #
import Cocoa for index in 1...5 { print("\(index) multiplying by 5 is：\(index * 5)") }
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
9.17.3. Example 2 #
import Cocoa var someInts:[Int] = [10, 20, 30] for index in someInts { print( "The value of index is \(index)") }
The value of index is 10 The value of index is 20 The value of index is 30