cnf-barcode/src/lib/barcodes/EAN_UPC/encoder.js

a barcode generator

import { BINARIES } from './constants';

// Encode data string
const encode = (data, structure, separator) => {
  let encoded = data
    .split('')
    .map((val, idx) => BINARIES[structure[idx]])
    .map((val, idx) => (val ? val[data[idx]] : ''));

  if (separator) {
    const last = data.length - 1;
    encoded = encoded.map((val, idx) => (
      idx < last ? val + separator : val
    ));
  }

  return encoded.join('');
};

export default encode;