Conditions

Hello,

In this lesson, we will learn about the conditional concept, which is a must for programming languages.

The first thing we will learn is if statement. With the if statement, we can run a block of code depending on the occurrence of a condition.

In the example below, the syntax of the if statement has been added.

The part expressed by conditional_expression is an expression that returns a bool value. If this expression returns true, the block of code between braces will work.

if conditional_expression {
   /* set of statements */
}

Suppose we have a number named count. If the value of this number is greater than 20 we will print the 'Yes, count is greater than 20' text

var count:Int = 20
 
if count > 20 {
   print("Yes, count is greater than 20")
}
 
print("always work")

In some cases, we may need some codes to work for situations where the if condition is not met.

An if-else statement is used for this. Let's find out with an example.

var age = 10

if age > 100 {
   print("if age is greater than 100")
} else {
   print("Works when the age is less than 100")
}
 

switch-case Statement

In some cases, we may want to control the fulfillment of multiple conditions with a single block of code. Even though we can use multiple if-else statements in such cases, the easier and more logical one is swift-case.

The example below contains a switch-case statement that works for 5 different conditions.

let someNumber = 150

switch someNumber {
case 50:
    print("Number is 50")
case 100:
    print("Number is 100")
case 150:
    print("Number is 150")
case 200:
    print("Number is 200")
case 250:
    print("Number is 250")
default:
    //If none of them meet the requirement then the default block will work.
    print("Otherwise, do something else.")
}

Congratulations 🎉

In this lesson, we learned how to use conditional statements in Swift.

See you in the next lesson.