Contents

<?php


function nucleotideCount($dna)
{
    $nucleotides = [];
    if (strlen($dna) > 0) {
        $nucleotides = str_split($dna);
    }
    $count = array_reduce($nucleotides, function ($count, $nucleotide) {
        if (! in_array(strtolower($nucleotide), ['a', 'c', 'g', 't'])) {
            throw new InvalidArgumentException(sprintf('The nucleotide %s does not exist in DNA', $nucleotide));
        }
        $count[strtolower($nucleotide)]++;

        return $count;
    }, [
        'a' => 0,
        'c' => 0,
        't' => 0,
        'g' => 0,
    ]);

    return $count;
}

Version data entries

384 entries across 384 versions & 1 rubygems

Version	Path
trackler-2.2.1.180	tracks/php/exercises/nucleotide-count/example.php
trackler-2.2.1.179	tracks/php/exercises/nucleotide-count/example.php
trackler-2.2.1.178	tracks/php/exercises/nucleotide-count/example.php
trackler-2.2.1.177	tracks/php/exercises/nucleotide-count/example.php
trackler-2.2.1.176	tracks/php/exercises/nucleotide-count/example.php
trackler-2.2.1.175	tracks/php/exercises/nucleotide-count/example.php
trackler-2.2.1.174	tracks/php/exercises/nucleotide-count/example.php
trackler-2.2.1.173	tracks/php/exercises/nucleotide-count/example.php
trackler-2.2.1.172	tracks/php/exercises/nucleotide-count/example.php
trackler-2.2.1.171	tracks/php/exercises/nucleotide-count/example.php
trackler-2.2.1.170	tracks/php/exercises/nucleotide-count/example.php
trackler-2.2.1.169	tracks/php/exercises/nucleotide-count/example.php
trackler-2.2.1.167	tracks/php/exercises/nucleotide-count/example.php
trackler-2.2.1.166	tracks/php/exercises/nucleotide-count/example.php
trackler-2.2.1.165	tracks/php/exercises/nucleotide-count/example.php
trackler-2.2.1.164	tracks/php/exercises/nucleotide-count/example.php
trackler-2.2.1.163	tracks/php/exercises/nucleotide-count/example.php
trackler-2.2.1.162	tracks/php/exercises/nucleotide-count/example.php
trackler-2.2.1.161	tracks/php/exercises/nucleotide-count/example.php
trackler-2.2.1.160	tracks/php/exercises/nucleotide-count/example.php