Programming in Kotlin: Fundamentals
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To get a hang of nullable values, and how to work around them using checks and smart casting, I’ve prepared a challenge for you.
Challenge:
Declare a variable of type String? called `password` and assign a value to it.
Using an if expression, check the level of password strength,
and assign an appropriate message to another constant named `message`.
Then print out the message.
Levels are designed as follows:
0 characters or `null` -> “Ehm, you need a password to keep safe!”
1-5 characters -> “Weak password! Try adding a few more symbols to it!”
6-10 characters -> “Medium-strength password.”
11-15 characters -> “No one is getting through this!”
15+ characters -> "Ironclad
val password: String? = "12345"
val message = if (password == null || password.isEmpty()) {
"Ehm, you need a password to keep safe!"
}
...
else if (password.length in 1..5) {
"Weak password! Try adding a few more symbols to it!"
} else if (password.length in 6..10) {
"Medium-strength password."
} else if (password.length in 11..15) {
"No one is getting through this!"
} else {
"Ironclad"
}
println(message)
val password: String? = "12345"
val passwordLength = password?.length ?: 0
val message = if (passwordLength == 0) {
"Ehm, you need a password to keep safe!"
} else if (passwordLength in 1..5) {
"Weak password! Try adding a few more symbols to it!"
} else if (passwordLength in 6..10) {
"Medium-strength password."
} else if (passwordLength in 11..15) {
"No one is getting through this!"
} else {
"Ironclad"
}