Kotlin has already defined some extension functions and Standard.kt is part of those functions. It has functions like with(), apply(), let(). The file has more than these extension functions, but we are only highlighting the ones commonly used in Android:
** * Calls the specified function [block] with the given [receiver] as its receiver and returns its result. */ @kotlin.internal.InlineOnly public inline fun <T, R> with(receiver: T, block: T.() -> R): R = receiver.block() /** * Calls the specified function [block] with `this` value as its receiver and returns `this` value. */ @kotlin.internal.InlineOnly public inline fun <T> T.apply(block: T.() -> Unit): T { block(); return this } /** * Calls the specified function ...
