Programmer dictionary: Receiver – Kotlin Academy
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Programmer dictionary: Receiver
Terms “receiver” and “sender” comes from sending letter metaphor. We can think about the sender as the object which invokes a method (postman delivering an email), the receiver is the object whose method is invoked (person receiving the letter). Let’s look at a simple example:
class Car {
private val engine = Engine()fun startEngine() {
engine.start()
}
}
In above example, an instance of Engine class is receiver and instance of Car class is the sender.
Under the hood when an object receives a message, it determines what method is being requested and passes control to the method
In Kotlin we mainly talk about receiver when discussing Lambdas with receiver and Extensions. The receiver is a general term, but there are also a few more specific terms related to receivers:
Any block of code in Kotlin may have one or more receivers. It makes functions and properties of the receiver available in that block of code without qualifying it.
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