``` for lookupTask in lookupTasks val serverUrl = lookupTask kotlinlang #getting-started

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getting-started

Title

u

ursus

01/20/2019, 4:17 AM

for (lookupTask in lookupTasks) {
    val serverUrl = lookupTask.execute(domain, username, password)
    if (serverUrl != null) {
        return serverUrl
    }
}
return null

p

Pavlo Liapota

01/20/2019, 8:59 AM

return lookupTasks
	.asSequence()
	.mapNotNull { it.execute(domain, username, password) }
	.firstOrNull()

👍 2

u

ursus

01/20/2019, 3:14 PM

doesnt really shortcut it, right?

a

Alowaniak

01/20/2019, 7:37 PM

what do you mean with "doesn't really shortcut it"? It's a sequence so it only does the mapping until it gets the first non null

u

ursus

01/21/2019, 3:51 PM

really? Ill investigate, because im pretty sure normal list.mapNotNull does all the items and skips the null ones

a

Alowaniak

01/21/2019, 3:53 PM

Yes, that's the case with a normal list or w/e. But that's why @Pavlo Liapota had

asSequence()

. Because they are a "lazy collection" like java's

Stream

See https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.sequences/index.html

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