Contents

'use strict';

module.exports = dna;

function dna(strand) {
  var acids = (strand || '');
  var index = histogram(acids);

  for (var acid in acids) {
    if (!index.hasOwnProperty(acids[acid])) throw new RangeError('Invalid DNA ' + strand);
  }

  return Object.create({
    histogram: histogram.bind(null, acids),
    count: count.bind(null, acids)
  });
}

function count(acids, acid) {
  return acids.split(acid).length - 1;
}

function histogram(acids) {
  return {
    A: count(acids, 'A'),
    C: count(acids, 'C'),
    G: count(acids, 'G'),
    T: count(acids, 'T')
  };
}

Version data entries

396 entries across 396 versions & 1 rubygems

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