CODEWITHSUNDEEP
kotlinwhile-loop
S. Unterhitzenberger
S. Unterhitzenberger

Reputation: 11

Kotlin - assign value inside while to use it outside

I'm very new in kotlin and wanted to solve following problem with a do while: I want to create a hash and want to check if there is the same hash stored in a key-value store as a key. In java I would make it with a String variable which I declared outside the while. But that will only work with a var in Kotlin and I learned that it is common practise to avoid var. My code looks as following (with var...)

var hash = ""
do {
    hash = createHash(longUrl)
    val optional = shortUrlRepository.findById(hash)
} while(optional.isPresent)

What would you say is the best way to solve this?

thank you a lot!

Upvotes: 1

Views: 323

Answers (1)

sirjoga
sirjoga

Reputation: 111

Maybe something like this?

val hash = generateSequence { createHash(longUrl) }
    .first { !shortUrlRepository.findById(it).isPresent }

... and of course, you can always localize var and pass it outside as val.

val someVal = run {
    var someVar: String = ""
    // do super logic with var
    someVar
}
...

Upvotes: 1

Related Questions