How to use the natural.Metaphone function in natural

/*!
 * levels
 * Copyright(c) 2013 Eugene Ware 
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var natural = require('natural')
  , metaphone = natural.Metaphone.process
  , stem = natural.PorterStemmer.stem
  , stopwords = natural.stopwords
  , sublevel = require('level-sublevel')
  , _ = require('underscore')
  , async = require('async')
  , byteup = require('byteup')
  , noop = function(){};

/* Add bytewise encoding */
byteup();

/**
 * Library version.
 */

exports.version = '0.0.3';

/*!
 * reds
 * Copyright(c) 2011 TJ Holowaychuk 
 * cn-search
 * Copyright(c) 2013 Sxyizhiren <786647787@qq.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var natural = require('natural');
var metaphone = natural.Metaphone.process;
var stem = natural.PorterStemmer.stem;
var stopwords = natural.stopwords;
var cnstopwords = require('./cnstopWords');

// default chinese segment
var Segment = require('segment').Segment;
var segment = new Segment();
segment.useDefault();

/**
 * Chinese Segment
 * @type {*}
 */
var segmentSync = function(str){
    var words=segment.doSegment(str);
    var result=[];

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

var natural = require('natural'),
    phonetic = natural.Metaphone;

var wordA = 'phonetics';
var stdin = process.openStdin();
stdin.setEncoding('ascii');

process.stdout.write('try to enter a word that sounds like "' + wordA +'": ');

stdin.on('data', function (wordB) {
	if(phonetic.compare(wordA, wordB))
	    process.stdout.write('they sound alike!\n');
	else
	    process.stdout.write('sorry, they don\'t sound alike.\n');

	process.exit();
    });

words,
    natural,
    metafone;

/*
 * Module dependencies.
 */

metaphone = require('./');

/*
 * Optional dependencies.
 */

try {
    natural = require('natural').Metaphone;
    metafone = require('./node_modules/metafone/metafone.js').convert;
} catch (error) {
    console.log(
        '\u001B[0;31m' +
        '  The libraries needed by this benchmark could not be found. ' +
        '  Please execute:\n' +
        '    npm run install-benchmark\n' +
        '\u001B[0m'
    );
}

/*
 * The first 1000 words from Letterpress:
 *   https://github.com/atebits/Words
 */

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

var natural = require('natural'),
    phonetic = natural.Metaphone;

phonetic.attach();
var wordA = 'phonetics';
var stdin = process.openStdin();
stdin.setEncoding('ascii');

process.stdout.write('try to enter a word that sounds like "' + wordA +'": ');

stdin.on('data', function (wordB) {
	if(wordA.soundsLike(wordB))
	    process.stdout.write('they sound alike!\n');
	else
	    process.stdout.write('sorry, they don\'t sound alike.\n');
	
	process.exit();
    });

/**
 * User: philliprosen
 * Date: 1/1/13
 * Time: 3:10 PM
 */
var natural = require('natural'),
    metaphone = natural.Metaphone,
    NGrams = natural.NGrams,
    TfIdf = natural.TfIdf;

metaphone.attach()

exports.Search = Search;

function Search(key, options) {
    var options = options || {};
    this.key = key;

    this.stopwords=options.stopwords ? options.stopwords : false;
    this.stopwords=options.naturalstop ? natural.stopwords : false;


}

/*!
 * reds
 * Copyright(c) 2011 TJ Holowaychuk 
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var natural = require('natural');
var metaphone = natural.Metaphone.process;
var stem = natural.PorterStemmer.stem;
var stopwords = natural.stopwords;
var redis = require('redis');
function noop(){};

/**
 * Library version.
 */

exports.version = '1.0.0';

/**
 * Expose `Search`.
 */

exports.Search = Search;

function metaphoneArray(words) {
  var arr = []
    , constant;
  for (var i = 0, len = words.length; i < len; ++i) {
    constant = natural.Metaphone.process(words[i]);
    if (!~arr.indexOf(constant)) arr.push(constant);
  }
  return arr;
}

let metaphoneDl = function(a, b, options) {
  let scoreDl = dlev(a, b).similarity;
  let scoreSoundex = 0;

  if (natural.Metaphone.compare(a, b)) {
    scoreSoundex = 1;
  }

  //let score = 0.5 * (scoreDl + scoreSoundex);
  let score = 0.5 * (scoreDl + scoreSoundex);
  if (score < options.threshold) score = 0.0;
  return score;
};