Control Flow In Swift

Ranjit Kumar

2 December 2021

In this blog, we will know about control flow in swift

There are multiple types of control flow in swift:-

while loop
for-in loop
if else
guard
switch

1. While-loop:-

While loop will perform on a single condition. It will perform until the condition will false.

while condition {statements}

1	while condition {statements}

the flow of the while loop:-

1. It will check the condition
2. if it is true
3. then it will execute the statement
4. if it is false
5. then it will not execute the statement

for example

let number = 10
while number &gt; 0{
print(number)
number = number + 1
}

let number = 10

while number > 0{

print(number)

number = number + 1

}

2. For – in loop:-

In this loop we can perform the statement until the condition

Syntex:

for val in sequence{
  // statements
}

for val in sequence{

// statements

}

example:-

for val in 1..&lt;10{
print(val)
}

for val in 1..<10{

print(val)

}

the flow of the for in loop:-

1. it will check the condition

2. if it is true
3. then it will execute the statement

4. it will increase the value of val
5. if it is false
6. then it will not execute the statement

3. If-else

it will compare the two objects and on the result of the comparison it will perform the statement

Syntex:-

if obj1 == obj2{

}else{

}

if obj1 == obj2{

}else{

}

example:-

var num1 = 1
var num2 = 2

if num1 == num2 {

print("true")
}else{
print("false")
}

var num1 = 1

var num2 = 2

if num1 == num2 {

print("true")

}else{

print("false")

}

4. Guard

It works the same as if-else it will check the condition and perform accordingly

Syntex:-

guard let obj1 = obj2 else {
return
}

guard let obj1 = obj2 else {

return

}

example:-

var obj1: String = ""


guard let obj2 = obj1 else {
                    return
}

var obj1: String = ""

guard let obj2 = obj1 else {

return

}

if obj1 has nil value then it will perform return and if it has value then it will assign value in obj2

5. Switch

It will perform like if-else but it is different from the if-else

in switch it will check the each condition and if it is matched to any one it will stop the matching with other

it has a default statement if there is not any matched statement then it will perform default statement

Syntex:-

switch obj{
case:
defaults:
}

switch obj{

case:

defaults:

}

for example

func checkswitch(num:Int){
switch number {

case 1:

print("1")

case 2:

print("2")

case 3:

print("3")

defaults:

print("defaults")

}
}

func checkswitch(num:Int){

switch number {

case 1:

print("1")

case 2:

print("2")

case 3:

print("3")

defaults:

print("defaults")

}

call the function checkswitch with the integer parameter

Conclusion

I hope this blog will help you to understand Swift control flow if you have any comments, questions, or recommendations, feel free to post them in the comment section below!

For other technical blogs, please click here .

If you want to know more about swift please check here