In Swift, if is a conditional statement used for making decisions in our code based on a given condition. Here's the basic structure of an if statement in Swift:
if condition {
// execute if condition is true
} else {
// execute if condition is false
}
Let's say we want to write code that prints "Hello, world!" if a given number is greater than 10. We can use an if statement to make that decision. Here's an example:
let num = 12
if num > 10 {
print("Hello, world!")
}
In this case, num > 10 is the condition we're checking. If it's true (which it is) then the code inside the if statement will be executed and "Hello, world!" will be printed to the console.
We can also use if statements in combination with else to execute different code depending on whether the condition is true or false. Let's say we want to print "Hello, world!" if a given number is greater than 10, and "Goodbye, world!" if it's not. We can do that like this:
let num = 5
if num > 10 {
print("Hello, world!")
} else {
print("Goodbye, world!")
}
Since num is less than 10 in this case, the code inside the else block will be executed and "Goodbye, world!" will be printed to the console instead.