Fallthrough in swift LEARNOVITA

Introduction to Swift Control Flow | Learn in 1 Day FREE Tutorial

Last updated on 12th Aug 2022, Blog, Tutorials

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fallthrough in swift:

The switch statement in Swift is quite strong and useful, similar to how it is in other programming languages. It begins by receiving a value, after which it performs a comparison with a number of possible matching patterns, also known as cases. It halts the execution of the programme once it has successfully found its first matching case statement, at which point it runs the code that is contained in the statement that was matched. It improves the efficiency of the programme by eliminating the need for repeated if-then statements. The switch statement does not get executed at the bottom of each case statement in Swift. Instead, the execution of the switch statement is completed when it comes across the first matching case. This occurs even in the absence of an explicit break statement. It makes using switch statements safer and easier, and it prevents accidentally executing several case statements at the same time.

You can use a fallthrough statement if you want the switch statement you’re working with to bypass the condition or if you want a feature similar to the one found in C. This statement is used to forcefully execute the case that is located immediately following the statement that was matched, despite the fact that the case does not match the condition that was stated. Keep in mind that it only executes one case statement that is present after the statement that was matched; it does not execute all case statements unless the fallthrough statement is used after all case statements.

  • // switch statement
  • var choice = 2
  • // Switch statement
  • switch(choice)
  • {
  • case 1:
  • print(“Hi! its Monday”)
  • case 2:
  • print(“Hi! its Tuesday”)
  • case 3:
  • print(“Hi! its Wednesday”)
  • case 4:
  • print(“Hi! its Thursday”)
  • case 5:
  • print(“Hi! its Friday”)
  • case 6:
  • print(“Hi! its Saturday”)
  • case 7:
  • print(“Hi! its Sunday”)
  • default:
  • print(“Choice not found”)
  • }
  • Out put:
  • Hi! its Friday
fallthrough in swift

Brief assertion of continuation:

The control flow of the programme advances to the next iteration of the loop when the continue command is encountered. Swift 4’s continue statement interrupts an ongoing loop and asks it to resume execution at the beginning of the next iteration.

Rapid-fire Prolonged Proclamation looping for:

The for loop’s continue declaration allows us to bypass the current iteration. The software then continues on to the next cycle. For instance:

For example:

  • for i in A…E {
  • if i == B {
  • continue
  • }
  • print(i)
  • }
  • Output:
  • A
  • C
  • D
  • E

Concise Summary of Swift:

Swift is a programming language that can be used to develop apps for iOS, macOS, watchOS, and tvOS. With your background in C and Objective-C development, you’ll feel right at home in many aspects of Swift. The first batch of Swift was sent out in 2010. It took Chris Lattner over 14 years to come up with the major authoritative adaptation, and it was later adopted by many different donors. Swift 4 is now available in the beta version of Xcode 6. Swift developers have adopted features from several other mainstream languages. These include Objective-C, Rust, Haskell, Ruby, PYTHON, C#, and CLU. Swift combines cutting-edge linguistics with the best ideas from Apple’s huge design culture. The language is designed without any shortcuts being taken in the compiler’s execution.

program:

  • var integer = 4
  • switch integer
  • {
  • case 5:
  • print(“Five.”)
  • fallthrough
  • case 4:
  • print(“Four.”)
  • fallthrough
  • case 3:
  • print(“Three.”)
  • fallthrough
  • case 2:
  • print(“Two.”)
  • fallthrough
  • case 1:
  • print(“One.”)
  • fallthrough
  • }
  • default:
  • print(“Done.”)

The while loop in Swift:

We may also bypass the current iteration of the while loop by using the continue comman.

For example:

  • // print odd numbers from -1 to -10
  • var x = 0
  • while x < -10{
  • x -= 1
  • if (x % 2) == 0 {
  • continue
  • }
  • print(“\(x)”)
  • }
  • Output:
  • -9
  • -7
  • -5
  • -3
  • -1
Swift Control Flow Chart

Labeling to proceed quickly:

Up until now, we’ve been making use of the continue statement without any labels. Labeled continue is a subtype of the continue statement available in Swift. A labelled continue statement can be used to bypass the iteration of an outer loop when nesting loops.

  • var grade: Character
  • switch grade
  • {
  • case “A”:
  • print (“Excellent! “)
  • fallthrough
  • case “B”:
  • print (“Well done! “)
  • fallthrough
  • case “C”:
  • print (“Good! “)
  • fallthrough
  • case “D”:
  • print (“You have passed.”)
  • case “F”:
  • print(“Failed”)
  • default:
  • print(“Undefined”)
  • }
  • Result:
  • Excellent
  • Well done
  • Good
  • You have passed
  • Failed
  • Undefined

A Brief Histories:

Swift 1: Apple announced Swift 1.0 as the new programming language for iOS and macOS application development in October of 2014. This announcement was made in 2014. Swift is currently being developed to become a cutting-edge programming language that is protected, swift, and intuitive.

Swift 2: At the WWDC Conference in September 2015, Apple announced Swift 2.0 as the most recent version of the Swift programming language, accompanied Xcode 8 editing management.

Swift 3: Swift 3.0 was announced by Apple in September 2016, and it included a number of important code modifications in addition to an upgrade for OOP Concept and other features.

Swift 4: Apple announced the release of Swift 4.0 in September 2017, and it includes several upgrades to core information types, such as strings, addendum, and so on.

Looping:

While loop: In the C language’s While Loop First, we will examine the condition; if it is satisfied, the control will proceed into the body of the loop; otherwise, it will exit the body. When the while loop is repeated, it will do so in a clockwise fashion.

While loop

for loop: A statement known as a “for loop” in C is one that enables programme code to be run repeatedly. Initialization, Condition, and Increments or Decrements are the three components that make up a for loop.

for loop

do..while Loop: We will utilise the do..while loop whenever we need to repeat the statement block at least once.

do..while Loop
  • outerloop: for x in E…S {
  • innerloop: for y in G…Y {
  • if y == G {
  • continue outerloop
  • }
  • print(“x = \(x), y = \(y)”)
  • }
  • }

conclusion:

To summarise, we gained a better knowledge of control with streaming in Swift as a result of this module. This stream is necessary at any point in time at which we are obliged to make a decision. The use of dynamic components gives the programmer the ability to specify at least one condition that should be checked or tried by the programme, as well as an assertion or statements that should be carried out in the event that the not set in stone is valid, and alternative justifications that should be carried out in the event that the condition is considered to be false.

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