Recap - Validation Function
Part of the Fundamentals section of Coddy's Kotlin journey. Lesson 62 of 93.
Challenge
MediumWrite a function isValidUsername that takes username and returns whether it meets the validation requirements.
A valid username must satisfy all of the following conditions:
- At least 3 characters long
- No more than 15 characters long
Parameters:
username(String): The username to validate
Returns: true if the username is valid, false otherwise (Boolean)
Try it yourself
fun isValidUsername(username: String): Boolean {
// Write code here
}
All lessons in Fundamentals
4Operators Part 1
Arithmetic OperatorsModulo OperatorAugmented AssignmentComparison OperatorsRecap - Simple Math7Basic IO
Println FunctionString TemplatesReadLine InputType ConversionRecap - Years Until RetirementRecap - True or False10Functions
Declare A FunctionParameters And ArgumentsReturn ValuesNamed ArgumentsDefault ValuesSingle Expression FunctionsRecap - Sigma FunctionRecap - Validation Function2Variables
Val vs VarType InferenceNumbersStringBooleanNaming ConventionsRecap - Initialize Variables5Operators Part 2
Logical Operators Part 1Logical Operators Part 2Logical Operators Part 3Ternary With If ExpressionRecap - Simple Logic8Bill Split Calculator
Welcome MessageGetting Input
Calculating Tip And TotalSplitting The BillFormatted Output3Nullability
What Is Null SafetyNullable TypesSafe Call OperatorElvis OperatorFunction Challenge BasicsNot Null AssertionRecap - Safe Access6Decision Making
If StatementIf - ElseIf As An ExpressionWhen ExpressionWhen With RangesRecap - Simple Calculator9Loops
For LoopWhile LoopDo-While LoopBreakContinueRanges In LoopsNested LoopRecap - FactorialRecap - Dynamic InputPractice on your own: Kotlin playground