stdlib NtSeq Parallelized Map Function

stdlib_ntseq_map.js

const Nt = require('ntseq'); // NtSeq library

module.exports = (params, callback) => {

  // Get query and genome sequences, as well as offset
  let q = (params.kwargs.q || '') + '';
  let seq = (params.kwargs.seq || '') + '';
  let offset = Math.max(0, parseInt(params.kwargs.offset) || 0);

  // Read sequences
  let query = new Nt.Seq().read(q);
  let sequence = new Nt.Seq().read(seq);

  // Let NtSeq do the sequence alignment mapping for us
  let map = sequence
    .mapSequence(query, offset)
    .initialize();

  // Return metadata and results
  return callback(null, {
    meta: map.__debug,
    data: map.results()
  });

};