How do I initialize a final field in Kotlin?

Let's say I declared a final field with `private final String s` (Java) or `val s` (Kotlin). During initialization I want to initialize the field with the result of a call to a remote service. In Java I would be able to initialize it in the constructor (e.g. `s = RemoteService.result()`), but in Kotlin I can't figure out how to do that because as far as I can tell the field has to be initialized in the same line it's declared. What's the solution here?

You can set `val` value in init block:

class MyClass {

val s: String

init {
s = "value"
}

}

You can also initialize the value with [`by lazy`](

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) the value will be initialized the first time it is referred. An example

val s by lazy { RemoteService.result() }

kotlin will guess the type of s from the return type of the expression.

It has been possible to do it simply like this since the very first official stable release of Kotlin:

class MyClass {
val s = RemoteService.result()
}

You can use [`run`][1]:

class MyClazz {
val prop = run {
// do stuff
// do stuff again
123 // return expression
}
}

From the [docs][1] (emphasis is mine):

> Besides calling `run` on a receiver object, you can use it as a non-extension function. ***Non-extension `run` lets you execute a block of several statements where an expression is required.***


[1]:

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