"kotlin elvis operator" Code Answer's
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!! in kotlin
//The not-null assertion operator
val l = b!!.length
Source: kotlinlang.org
elvis operator kotlin example
val l = b?.length ?: -1
kotlin elvis operator
In Kotlin, if statements are expressions. So the following code is equivalent:
if (a) b else c
The distinction between expression and statement is important here. In Java/C#/JavaScript, if forms a statement, meaning that it does not resolve to a value. More concretely, you can't assign it to a variable.
// Valid Kotlin, but invalid Java/C#/JavaScript
var v = if (a) b else c
If you're coming from a language where if is a statement, this might seem unnatural but that feeling should soon subside.
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