@senthiljruby/inwords/lib/index.js

Multi-lingual Feathers Plugin to convert number to word (number system)

const util = require('./utils');

let langObj;

module.exports = function () {
  return function (app) {
    app.mixins.push(function (service) {
      service.inWords = function (number, language = 'en') {
        const _language = ['en', 'in'];
        if (_language.indexOf(language) > -1) {
          langObj = require('../i18n/' + language + '.json');
        } else {
          throw new Error('Language not found');
        }
        if (!util.isNumber(number)) {
          throw new Error('Input is not a number');
        }
        number = Math.floor(number);
        const returnResp = numberToText(number, langObj);
        return returnResp;
      };
    });
  };
};

function radialBaseConveration (number) {
  const str = number.toString();
  const radPows = langObj.radials || [0, 2, 3, 6, 9];

  const radialBase = [];

  for (let i = 0; i < radPows.length; i++) {
    const _from = i < radPows.length - 1 ? -1 * radPows[i + 1] : 0;
    const _to = -1 * radPows[i] || undefined;
    radialBase.push(str.slice(_from, _to));
  }

  return radialBase;
}

function numberToText (number, langObj) {
  if (langObj.ones[number]) {
    return langObj.ones[number];
  }

  if (number <= 99) {
    const str = number.toString();
    let returnResp = langObj.tens[str[0]];
    if (str[1] !== '0') {
      returnResp = langObj.reverseOnes ? langObj.ones[str[1]] + ' ' + returnResp : returnResp + ' ' + langObj.ones[str[1]];
    }
    return util.trim(returnResp, ' ');
  }

  const groups = radialBaseConveration(number);
  let output = '';
  for (let i = 0; i < groups.length; i++) {
    const num = parseInt(groups[i], 10);
    if (num > 0) {
      const sep = output ? ' ' : '';
      const groupName = num > 1 ? numberToText(num, langObj) + ' ' + langObj.pluralNames[i] : langObj.singularNames[i];
      output = groupName + sep + output;
    }
  }
  return util.trim(output, ' ');
}