Scala: Elegant conversion of a string into a boolean

user_169484 0
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In Java you can write Boolean.valueOf(myString). However in Scala, java.lang.Boolean is hidden by scala.Boolean which lacks this function. It's easy enough to switch to using the original Java version of a boolean, but that just doesn't seem right.

So what is the one-line, canonical solution in Scala for extracting true from a string?

scala
6 Answers

Scala 2.13 introduced String::toBooleanOption, which combined to Option::getOrElse, provides a safe way to extract a Boolean as a String:

"true".toBooleanOption.getOrElse(false)  // true
"false".toBooleanOption.getOrElse(false) // false
"oups".toBooleanOption.getOrElse(false)  // false
user_92971440

I've been having fun with this today, mapping a 1/0 set of values to boolean. I had to revert back to Spark 1.4.1, and I finally got it working with:

Try(if (p(11).toString == "1" || p(11).toString == "true") true else false).getOrElse(false))

where p(11) is the dataframe field

my previous version didn't have the "Try", this works, other ways of doing it are available ...

user_1880590
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