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-2.1.0.55	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.54	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.53	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.52	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.51	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.50	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.49	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.48	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.47	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.46	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.45	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.44	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.43	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.42	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.41	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.40	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.39	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.38	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.37	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt
trackler-2.1.0.36	tracks/kotlin/exercises/nucleotide-count/src/example/kotlin/DNA.kt