Contents

class DNA(strand: String) {
    init {
        require(strand.matches(Regex("^[$nucleotides]*$")), { "DNA sequence contains invalid nucleotides sequence." })
    }

    companion object DNA {
        val nucleotides = "ATCG"
        val emptyNucleotideCounts = nucleotides.map { it to 0 }.toMap()
    }

    val nucleotideCounts: Map<Char, Int> by lazy {
        emptyNucleotideCounts + strand.groupBy { it }.mapValues { it.value.size }
    }

    fun count(nucleotide: Char): Int {
        require(nucleotide in nucleotides, { "$nucleotide is not a nucleotide" })

        return nucleotideCounts[nucleotide] ?: 0
    }
}

Version data entries

270 entries across 270 versions & 1 rubygems

Version	Path
trackler-2.2.1.12	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.2.1.11	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.2.1.10	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.2.1.9	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.2.1.8	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.2.1.7	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.2.1.6	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.2.1.5	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.2.1.4	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.2.1.3	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.2.1.2	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.2.1.1	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.2.1.0	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.2.0.6	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.2.0.5	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.2.0.4	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.2.0.3	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.2.0.2	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.2.0.1	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.2.0.0	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt