kotlin-coding-challenges

Any callback

Nice to solve before

• Count down
• Get odd

Instructions

Given list of integers and callback implement a recursive function which returns true if simple value in the list passed to callback returns true, otherwise return false.

Challenge

Solution

Tests

Limitations

Don’t use any Kotlin build-in methods that already answer the question like any / none / all / find / firstOrNull / filter / contains / indexOfFirst, etc. Don’t use a loop (for / while / forEach) either - the function has to call itself.

Examples

Example 1

val callback:((Int) -> Boolean) = { it > 3 }
anyCallback(listOf(1, 2, 3, 4), callback) shouldBeEqualTo true

Example 2

val callback:((Int) -> Boolean) = { it > 3 }
anyCallback(listOf(1, 2, 3), callback) shouldBeEqualTo false

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