What's the equivalent of Scala's getOrElse in Rust?

Question

In Scala, I can use getOrElse as a convenient way to get a default value from Option, what's the equivalent of this in Rust?

val threeOpt = Some(3)
val shouldBeThree = threeOpt.getOrElse(-1) // got 3

Answer 1

You can use either unwrap_or or unwrap_or_else

• unwrap_or is eagerly evaluated
• unwrap_or_else is lazily evaluated

See here for differences between eager and lazy