CODEWITHSUNDEEP
kotlinbuilt-in
christian meyer
christian meyer

Reputation: 71

Kotlin: function to stop iteration when predicate satisfied

I'm looking for a function in Kotlin which stops an iteration once a predicate is fulfilled:

val services = listOf(service1, service2)
...
var res: Result = null
services.stopIfPredicateFulFilled { service ->
    res = service.doSomething()
    res != null
}

While this example is not really nice since res is overwritten in each iteration I hope the intention is clear. forEach doesn't do the job the way I expect it to be done. So, I was wondering if there isn't anything else.

Upvotes: 1

Views: 423

Answers (1)

hotkey
hotkey

Reputation: 147911

You can use the functions find { ... } and firstOrNull { ... } (they are equivalent, just named differently). They find the first element satisfying the predicate and return that element, ignoring all the remaining elements.

services.find { service ->
    res = service.doSomething()
    res != null
}

Upvotes: 2

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