Swift programming for Beginners – Swift continue Statement

(Swift for Beginners)

Swift continue Statement

In this article, you will learn to use continue statement to transfer control of the program.

While you are working with loops or conditional statements, you may require to skip some statements inside the loop or terminate the loop immediately without checking the test expression.

 

In such cases, break and continue statements are used. Visit the page to learn more about break statement.

The continue statement stops the execution of statements inside a loop or a switch statement. It then skips back to evaluate the loop’s test expression again.

The syntax of a continue statement is:

continue

How continue statement works?

Swif continue statement

Example 1: Swift continue statement in for loop

for i in 1...5 {
    if i == 4 {
        continue
    }
    print("i = (i)")
}

When you run the program, the output will be:

i = 1
i = 2
i = 3
i = 5

In the above program, the sequence being iterated over is a range from 1 to 5.

The value of i is set to the first number in the range (1), and updated to the next number of the range on each iteration.

The loop also contains an if statement with expression i == 4. The expression when evaluated to true (on 4th iteration) executes the continue statement, skips the execution of statement print("i = (i)") and moves to the next iteration (i = 5).


Example 2: Swift continue statement in while loop

var intialLevel:Int = -5, finalLevel:Int = 2
var currentLevel:Int = intialLevel

while currentLevel < finalLevel {
    if intialLevel < 0 {
        print("Starting level must be positive")
        intialLevel = 0
        currentLevel = intialLevel
        continue //skips the current execution
    }
    currentLevel += 1
    print("next level")
}
print("outside of while loop")

When you run the program,the output will be:

Starting level must be positive
next level
next level
outside of while loop

In the above program, the while loop runs until currentLevel is less than finalLevel. Since, intialLevel is assigned value -5 and is less than 0, statements inside the if executes.

When the program reaches continue statement, it skips the statements of the while loop and jumps to check the condition currentLevel < finalLevel again.


Example 3: Swift continue statement with nested loops

for j in 1...2 {
    for i in 1...5 {
        if i == 4 {
            continue
        }
        print("i = (i)")
    }
    print("j = (j)")
}

When you run the program,the output will be:

i = 1
i = 2
i = 3
i = 5
j = 1
i = 1
i = 2
i = 3
i = 5

In the above program, continue statement inside the if i == 4 only skips the execution of statement print("i = (i)") inside the inner for loop. However, it doesn’t skip the execution of outer loop for i in 1...5.

But, what if you want to continue the outerloop as well. For that, you need to use labeled statements in Swift.


Labeled Statement with continue

Statements that have prefixes in the form (label : Statement) are called as labeled statement. The label is an identifier which you can refer later in the break or continue statements. To learn more about labeled statements, visit Swift labeled statement.

How labeled statement with continue works?

Swift labeled statement with continue

Here, label is an identifier. When continue statement executes, the program skips the rest of the coe inside the loop and jumps to the statement where label starts.

Example 4: Labeled Statement with continue

outerloop: for j in 1...2 {
    innerloop: for i in 1...5 {
        if i == 4 {
            continue outerloop
        }
        print("i = (i)")
    }
    print("j = (j)")
}

When you run the program, the output will be:

i = 1
i = 2
i = 3
i = 1
i = 2
i = 3

In the above program, there are two labeled statements outerloop: for j in 1...2 and innerloop: for i in 1...5.

The label names outerloop and innerloop can be used with the continue statement.

In the program, we have used the statement continue outerloop to skip the execution of statements inside both inner and outer loops. In the process, values of both i and j are updated to the next number in the range.

 

Swift programming for Beginners – Swift continue Statement

Personal Career & Learning Guide for Data Analyst, Data Engineer and Data Scientist

Applied Machine Learning & Data Science Projects and Coding Recipes for Beginners

A list of FREE programming examples together with eTutorials & eBooks @ SETScholars

95% Discount on “Projects & Recipes, tutorials, ebooks”

Projects and Coding Recipes, eTutorials and eBooks: The best All-in-One resources for Data Analyst, Data Scientist, Machine Learning Engineer and Software Developer

Topics included: Classification, Clustering, Regression, Forecasting, Algorithms, Data Structures, Data Analytics & Data Science, Deep Learning, Machine Learning, Programming Languages and Software Tools & Packages.
(Discount is valid for limited time only)

Disclaimer: The information and code presented within this recipe/tutorial is only for educational and coaching purposes for beginners and developers. Anyone can practice and apply the recipe/tutorial presented here, but the reader is taking full responsibility for his/her actions. The author (content curator) of this recipe (code / program) has made every effort to ensure the accuracy of the information was correct at time of publication. The author (content curator) does not assume and hereby disclaims any liability to any party for any loss, damage, or disruption caused by errors or omissions, whether such errors or omissions result from accident, negligence, or any other cause. The information presented here could also be found in public knowledge domains.

Learn by Coding: v-Tutorials on Applied Machine Learning and Data Science for Beginners

Please do not waste your valuable time by watching videos, rather use end-to-end (Python and R) recipes from Professional Data Scientists to practice coding, and land the most demandable jobs in the fields of Predictive analytics & AI (Machine Learning and Data Science).

The objective is to guide the developers & analysts to “Learn how to Code” for Applied AI using end-to-end coding solutions, and unlock the world of opportunities!