Hacker news link navigator

// ==UserScript==
// @name         Hacker news Link navigator
// @namespace    https://news.ycombinator.com/
// @version      0.1
// @description  Read hacker news links and allow user to click on them with voice !
// @author       Siddharth Chhaabra
// @match        https://news.ycombinator.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
     function makeUniqueKey(anchorTagKeywords, items, anchorTag) {
         for (var i = 0; i < anchorTagKeywords.length; i++) {
             var key = anchorTagKeywords[i].toLowerCase();
             if (key in items || key.includes("'") || key.includes('-')) {
                 continue;
             } else {
                 var boldText = "<strong>" + anchorTagKeywords[i] + "</strong>";
                 var anchorTagText = anchorTag.text;
                 anchorTagText = anchorTagText.replace(anchorTagKeywords[i], boldText);
                 anchorTag.innerHTML = anchorTagText;
                 return key;
             }
         }
     }
     function getLinks() {
         var items = {};
         var links = document.getElementsByClassName('storylink');
         for (var i = 0; i < links.length; i++) {
             var anchorTag = links[i];
             var anchorText = anchorTag.text;
             var uniqueKey = makeUniqueKey(anchorText.split(' '), items, anchorTag);
             items[uniqueKey] = anchorTag.href;
         }
         return items;
     }
    var linksDict = getLinks();
    var linkNames = Object.keys(linksDict);
    var grammar = '#JSGF V1.0; grammar link; public <link> = ' + linkNames.join(' | ') + ' ;';
    var SpeechRecognition = SpeechRecognition || webkitSpeechRecognition;
    var SpeechGrammarList = SpeechGrammarList || webkitSpeechGrammarList;
    var SpeechRecognitionEvent = SpeechRecognitionEvent || webkitSpeechRecognitionEvent;
    var recognition = new SpeechRecognition();
    var speechRecognitionList = new SpeechGrammarList();
    speechRecognitionList.addFromString(grammar, 1);
    recognition.grammars = speechRecognitionList;
    //recognition.continuous = false;
    recognition.lang = 'en-US';
    recognition.interimResults = false;
    recognition.maxAlternatives = 1;
    document.body.onclick = function() {
        recognition.start();
        console.log('Ready to receive a link naviagte command.');
    };

    recognition.onresult = function(event) {
        // The SpeechRecognitionEvent results property returns a SpeechRecognitionResultList object
        // The SpeechRecognitionResultList object contains SpeechRecognitionResult objects.
        // It has a getter so it can be accessed like an array
        // The [last] returns the SpeechRecognitionResult at the last position.
        // Each SpeechRecognitionResult object contains SpeechRecognitionAlternative objects that contain individual results.
        // These also have getters so they can be accessed like arrays.
        // The [0] returns the SpeechRecognitionAlternative at position 0.
        // We then return the transcript property of the SpeechRecognitionAlternative object

        var last = event.results.length - 1;
        var link = event.results[last][0].transcript;
        link = link.toLowerCase();
        alert(link);
        console.log('Result received: ' + link);
        if(linkNames.indexOf(link) > -1) {
            window.location.href = linksDict[link];
        }
        console.log('Confidence: ' + event.results[0][0].confidence);
    };

    recognition.onspeechend = function() {
        recognition.stop();
    };

    recognition.onnomatch = function(event) {
        console.log("I didn't recognise that link.");
    };

    recognition.onerror = function(event) {
        console.log('Error occurred in recognition: ' + event.error);
    };

})();