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-2.2.1.52	tracks/kotlin/exercises/nucleotide-count/.meta/src/reference/kotlin/DNA.kt
trackler-2.2.1.51	tracks/kotlin/exercises/nucleotide-count/.meta/src/reference/kotlin/DNA.kt
trackler-2.2.1.50	tracks/kotlin/exercises/nucleotide-count/.meta/src/reference/kotlin/DNA.kt
trackler-2.2.1.49	tracks/kotlin/exercises/nucleotide-count/.meta/src/reference/kotlin/DNA.kt
trackler-2.2.1.48	tracks/kotlin/exercises/nucleotide-count/.meta/src/reference/kotlin/DNA.kt
trackler-2.2.1.47	tracks/kotlin/exercises/nucleotide-count/.meta/src/reference/kotlin/DNA.kt
trackler-2.2.1.46	tracks/kotlin/exercises/nucleotide-count/.meta/src/reference/kotlin/DNA.kt
trackler-2.2.1.45	tracks/kotlin/exercises/nucleotide-count/.meta/src/reference/kotlin/DNA.kt
trackler-2.2.1.44	tracks/kotlin/exercises/nucleotide-count/.meta/src/reference/kotlin/DNA.kt
trackler-2.2.1.43	tracks/kotlin/exercises/nucleotide-count/.meta/src/reference/kotlin/DNA.kt
trackler-2.2.1.42	tracks/kotlin/exercises/nucleotide-count/.meta/src/reference/kotlin/DNA.kt
trackler-2.2.1.41	tracks/kotlin/exercises/nucleotide-count/.meta/src/reference/kotlin/DNA.kt
trackler-2.2.1.40	tracks/kotlin/exercises/nucleotide-count/.meta/src/reference/kotlin/DNA.kt
trackler-2.2.1.39	tracks/kotlin/exercises/nucleotide-count/.meta/src/reference/kotlin/DNA.kt
trackler-2.2.1.38	tracks/kotlin/exercises/nucleotide-count/.meta/src/reference/kotlin/DNA.kt
trackler-2.2.1.37	tracks/kotlin/exercises/nucleotide-count/.meta/src/reference/kotlin/DNA.kt
trackler-2.2.1.36	tracks/kotlin/exercises/nucleotide-count/.meta/src/reference/kotlin/DNA.kt
trackler-2.2.1.35	tracks/kotlin/exercises/nucleotide-count/.meta/src/reference/kotlin/DNA.kt
trackler-2.2.1.34	tracks/kotlin/exercises/nucleotide-count/.meta/src/reference/kotlin/DNA.kt
trackler-2.2.1.33	tracks/kotlin/exercises/nucleotide-count/.meta/src/reference/kotlin/DNA.kt