Programming in Kotlin: Fundamentals
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Previous episode: 7. Branch with If Expressions & Scopes
Next episode: 9. Conclusion
This video Challenge: Practice If Expressions & Boolean Logic was last updated on Aug 9 2022
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Booleans and if statements and expressions are really powerful, which is why I’ve got an awesome challenge for you to practice them! :]
Challenge :
Check if the user data for registering an account is valid.
Data is valid if:
1. Properties are not empty.
2. Username has at least 6 characters.
3. Password has at least 10 characters.
4. The email contains a '@' and a ‘.`.
Hint: use the `contains()` function on a String to check if a value is contained in it.
Hint: use the `isEmpty()` function on a String to check if the string is empty.
Example: email.isEmpty()
Use `if` as an expression, to assign a respective error message if any of the cases fail! Then print it out.
The messages are prepared for you in the project.
val email = "filip@mail.com"
val password = "password123"
val username = "filip.babic"
val message = if(email.isEmpty() || password.isEmpty() || username.isEmpty()) {
} else if (username.length < 6) {
}
val message = if(email.isEmpty() || password.isEmpty() || username.isEmpty()) {
} else if (username.length < 6) {
} else if(password.length < 10) {
}
val message = if(email.isEmpty() || password.isEmpty() || username.isEmpty()) {
} else if (username.length < 6) {
} else if(password.length < 10) {
} else if (!email.contains("@") || !email.contains(".")) {
}
val message = if(email.isEmpty() || password.isEmpty() || username.isEmpty()) {
} else if (username.length < 6) {
} else if(password.length < 10) {
} else if (!email.contains("@") || !email.contains(".")) {
} else {
}
val message = if (email.isEmpty() || password.isEmpty() || username.isEmpty()) {
"You must fill in your data!"
} else if (username.length < 6) {
"Username needs to be at least 6 characters long!"
} else if (password.length < 10) {
"Password needs to be at least 10 characters long!"
} else if (!email.contains("@") || !email.contains(".")) {
"Invalid email format."
} else {
"Successful registration!"
}
println(message)
val email = "filip@mail.com"
val password = "password"
val username = "filip.babic"