Stemmers

Sometimes, it is useful to find the root or stem of a word. In the English language, irregular verb conjugations are not uncommon. By deducing the root of a verb, we can dramatically decrease the amount of calculations needed to find the action of the phrase. Take the verb searching for example; for the purpose of bots, it would be much easier to process the verb in its root form search. Here, a stemmer can help us determine said root. Replace the contents of index.js with the following to demonstrate stemmers:

'use strict';

// import the natural library
const natural = require('natural');

const Bot = require('./Bot');

// initialize the stemmer
const stemmer = natural.PorterStemmer;

// attach the stemmer to the prototype of String, enabling
// us to use it as a native String function
stemmer.attach();

const bot = new Bot({
  token: process.env.SLACK_TOKEN,
  autoReconnect: true,
  autoMark: true
});

// respond to any message that comes through
bot.respondTo('', (message, channel...