Control Transfer Statements in swift- `continue, break, fallthrough in swift

In this article, we will look at the continue, break, fallthrough keywords in swift

Continue: A continue statement ends program execution of the current iteration of a loop statement and move to next iteration.

Ex: Increment the values of odd number in the array

func increment(array: [Int]) -> [Int] { var output: [Int] = []

for number in array {
///Check if value is even
    if number % 2 == 0 { 
    ///number append to output array and move to next iteration      
       output.append(number)
       continue
    }
   ///This statement is skipped for even number 
   output.append(number + 1)
}
return output

}

swiftnil.com: Continue statement

-————————- Input: increment(array: [1,2,3,4,5,6,7,8]) Output: [2, 2, 4, 4, 6, 6, 8, 8]

Break: The Break statement exit the execution of an entire control flow immediately.

Ex: Increment the values the array until value is `n`

func increment(array: [Int], until: Int) -> [Int] { var output: [Int] = []

for number in array { if number == until { break } output.append(number + 1) } return output }

swiftnil.com: Break statement

-————————- Input: increment(array: [1,2,3,4,5,6,7,8], until: 5) Output: [2, 3, 4, 5]

Fallthrough: In Swift, switch statements exist the execution as soon as case is matched so, fallthrough is used to continue to next case even after the case is matched

var index = 10

switch index { case 100 : print( “Value of index is 100”) fallthrough case 10,15 : print( “Value of index is either 10 or 15”) fallthrough case 5 : print( “Value of index is 5”) default : print( “default case”) }

swiftnil.com: Fallthrough statement

Reference

https://docs.swift.org/swift-book/LanguageGuide/ControlFlow.html