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-2.1.0.34	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.33	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.32	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.31	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.30	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.29	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.28	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.27	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.26	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.25	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.24	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.23	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.22	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.21	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.20	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.19	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.18	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.17	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.16	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.15	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt