Swift guard with multiple conditions
Multiple criteria separated by commas can be evaluated using guard statements (,). If at least one condition evaluates false, the guard statement's body will be performed. In other words, the body of the guard statement is not executed until and until all of the conditions are met, similar to logical AND. Otherwise, the guard statement's body will always be performed.
Syntax:
guard condition1, condition2, ….. else {
//statement
}
Example: Swift guard with multiple conditions
func iaseligibility() {
var age = 17
guard age >= 21, age < 32 else {
print("You are not eligible.")
return
}
print("If you are general category, then you are eligible")
}
iaseligibility()
Output
You are not eligible.
The logical AND relationship between two conditions will be present here. Only if both requirements are valid is the guard condition actual.
Swift guard-let Statement
When working with Swift Optionals, the guard statement is used as the guard-let statement.
Example: Swift guard-let Statement
func checkAge() {
var age: Int? = 18
guard let myAge = age else {
print("You are not 18 years old")
return
}
print("You are 18 years old")
}
checkAge()
Output
You are 18 years old
The code inside the guard-let block is not performed because age has some value. checkAge functions similarly to the proper guard condition.
Swift Break Statement
The break statement is a control statement used to immediately stop the execution of the full control flow statement. It simply interrupts the program's current flow when specific criteria are met. It can be used inside when you want to halt the execution of a switch or loop statement early. This phrase is typically used when we aren't sure how many iterations we want or when we want the loop to end based on a condition.
Syntax:
break
Swift break statement with for loop.
When a condition is met, we can use the break statement with the for loop to end it.
Syntax:
for items in sequence{
// statement
break
}
Example: break statement with for loop
for j in 1...8{
if j == 4 {
break
}
print(j)
}
Output
1
2
3
When j equals 4, the loop exit with the break statement, as a result, the output excludes values after 3.
Swift break statement with a while loop
The break condition can also be used to end a while loop.
Syntax:
while (condition)
{
// statement
// Condition for break statement
if (condition)
{
break
}
}
Example: break statement with a while loop
// program to find the first four multiples of 5
var j = 1
while (j<=10) {
print("6 * \(j) =",5 * j)
if j >= 4 {
break
}
j = j + 1
}
Output
6 * 1 = 5
6 * 2 = 10
6 * 3 = 15
6 * 4 = 20
In the example, we have used the while loop to find the first four multiples of 5. When j is greater than or equal to 4, the while loop is terminated.
Swift break statement with nested loops
The break statement stops the inner loop when used with nested loops
Syntax:
// Outer for loop
for value1 in series1
{
// Inner for loop
for value2 in series2
{
// break condition
if (condition)
{
break
}
}
}
Example: break statement with a nested loop
// outer for loop
for i in 1...6 {
// inner for loop
for j in 1...3 {
if i == 2 {
break
}
print("i = \(i), j = \(j)")
}
}
Output
i = 1, j = 1
i = 1, j = 2
i = 1, j = 3
i = 3, j = 1
i = 3, j = 2
i = 3, j = 3
i = 4, j = 1
i = 4, j = 2
i = 4, j = 3
i = 5, j = 1
i = 5, j = 2
i = 5, j = 3
i = 6, j = 1
i = 6, j = 2
i = 6, j = 3
In the preceding example, we utilized the break statement inside the inner for loop.
The break statement is performed when the value of i is 2. It ends the inner loop and moves the program's control flow to the outer loop.
As a result, the output never shows the value of i = 2.
Frequently Asked Questions
In Swift, what is the purpose of the guard statement?
When specific requirements are not met, the guard statement in Swift is used to shift program control out of scope.
Why is the break statement required in a switch?
You can use the break statement to stop the switch statement from processing a piece of specific labelled information. It follows the switch statement until the end. Without a break, the program moves on to the following designated statement and executes it until it reaches a break or the end of the
information.
What is the primary difference between continue and break?
The main distinction between the break and continue statements in C is that the break statement causes the innermost switch or enclosing loop to terminate immediately. On the other hand, the continue statement starts the next iteration of the while, for, or do loop.
Conclusion
This article has thoroughly covered the concept of the break and continue statement. We began with an overview of Swift guard and break and then went over each syntax and example in detail, complete with explanations, code, and output statements.
We hope that this blog has improved your understanding of Swift loops, and if you would like to learn more, check out our blogs, the Definitive Swift Tutorial for Beginners, and why iOS & OS X Developers are choosing Swift? and which is better to learn? iOS or Android?.
Happy learning!
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