kotlin elvis operator

//The not-null assertion operator
val l = b!!.length

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3.5

Gotube 70 points

                                    val l = b?.length ?: -1

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3.5 (2 Votes)

3.57

Mightyoscar 90 points

                                    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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3.57 (7 Votes)

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kotlin elvis operator

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