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April 7, 2020 04:27
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Kotlin - Map.associateBy and Elvis operator
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| // Example of Map.associateBy() in Kotlin | |
| // Map vowels to their positions in the alphabet | |
| val vowels = "aeiou".toCharArray() // ['a', 'e', 'i', 'o', 'u'] | |
| // Map<Char, Int> = {a=1, e=5, i=9, o=15, u=21} | |
| val positions = vowels.associateBy({ it }, { it.toInt() - 'a'.toInt() + 1 }) | |
| val letter = readLine()!! | |
| println(positions[letter.first().toLowerCase()] ?: 0) // default == 0 if not a vowel |
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