How to create a constant in Swift Programming?

You have to use the let keyword to declare a constant in Swift Programming. Here is the example in which we show you how to use declare street as a constant in lieu of a variable. But for this, you need to use let keyword.

1. let street: String = "5th Avenue"
2. var number: Int
3. street = "Main Street"
4. number = 10

Swift does not allow you to change the value of constant. If you want to update the first line then XCode will show an error for a naive reason. Comment out or remove the line in which you want to change the value to the street so that it won't create any type of error.

1. let street: String = "5th Avenue"
2. var number: Int
3. // street = "Main Street"
4. number = 10