Kotlin functions, default arguments, lambdas, higher-order functions, collection operations, sequences and scope functions.
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- How do you declare a function with parameters and return type in Kotlin?
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fun functionName(param1: Type, param2: Type): ReturnType { ... }- How do you define a default parameter value in Kotlin?
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fun greet(name: String = "World") { ... }- What is a named argument in Kotlin?
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Passing arguments by name, e.g., greet(name = "Alice")- How do you write a single-expression function?
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fun add(a: Int, b: Int) = a + b- What does Unit represent as a return type?
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The absence of a meaningful return value, equivalent to void in Java- Can you omit the return type in Kotlin if it is obvious?
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Yes, Kotlin can infer return types in most contexts- How do you declare a function type in Kotlin?
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(ParameterType) -> ReturnType, for example (Int, Int) -> String- What is the basic syntax for a lambda expression?
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{ param -> expression } or { (param1, param2) -> expression }- How do you write a lambda with multiple parameters?
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{ x, y -> x + y } or { (x: Int, y: Int) -> x + y }- How do you write a lambda with no parameters?
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{ } or { -> code }- Define a higher-order function
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A function that takes another function as a parameter or returns a function- How do you pass a lambda to a higher-order function?
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Pass it as an argument, optionally using trailing lambda syntax outside parentheses- What is the main difference between lambda and anonymous function?
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Anonymous functions have explicit return types; lambdas use implicit return of the last expression- What does the let scope function do?
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Executes a code block with the object as parameter (it) and returns the block result- What does the run scope function do?
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Executes a code block with the object as this and returns the block result
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