It's very easy to create a custom getter for a property in Kotlin.Ĭlass Car private constructor ( val name: String, val plateNo: String ) is alive and married inside second initializer!' )Įxecuting first initializer block for Amanda.Įxecuting second initializer block for Amanda.Ĭannot confirm if Amanda is alive and married inside second initializer! Unlike value, you can't rename this special field variable. This special field variable field inside the set method is an alias for the backing field of the property-a backing field is just a field that is used by properties when you want to modify or use that field data. If empty, stop execution and throw an exception otherwise, reassign the value to a special field variable. We validated the value by checking if the value is empty. The parameter value passed to the set method represents the actual value that was assigned to the property by users-you can change the parameter name if you wish, but value is much preferred.

You can see we defined our own setter method set(value) for the title right below the property definition-note that you can't modify this set() method signature because this is what the compiler expects as a custom property setter function. * */ /* * * * */ public fun callsInPlace(lambda: Function, kind: InvocationKind = InvocationKind.Throw IllegalArgumentException ( 'Title must not be empty' ) * * A function declaring the `callsInPlace` effect must be _inline_. _(optionally)_ the function is invoked the amount of times specified by the parameter, * see the enum for possible values. the function can only be invoked during the call of the owner function, * and it won't be invoked after that owner function call is completed * 2. ** * Specifies that the function parameter is invoked in place.

What conditions it superimposed, we need to check the parameter of the contractĪnd what contract applied in the run functions ? This superimposes some conditions on the lambda we passed as a parameter to the run function. This is exactly the same contract as to any other scope function.

Kotlin internal class meaning