phylotree/src/msa-parsers/fasta.js

A JavaScript library for developing applications and interactive visualizations involving [phylogenetic trees](https://en.wikipedia.org/wiki/Phylogenetic_tree), written as an extension of the [D3](http://d3js.org) [hierarchy layout](https://github.com/d3/

import * as _ from "lodash";

export default function parseFasta(fastaData) {


  let sfasta = _.split(fastaData, "\n");

  let seqs = _.chain(sfasta)
    .map((d, i) => (d.startsWith(">") ? i : -1))
    .filter((d) => d != -1)
    .map((d, i, c) => _.slice(sfasta, c[i], c[i + 1]))
    .keyBy((d) => _.trim(d[0], ">"))
    .mapValues((d) => _.tail(d).join(""))
    .value();

  return seqs;

}