index.js

var request = async () => {
    const response = await fetch('assets/norvig.txt');
    const text = await response.text();
    repWord(text);

}


function repWord(text) {
    var wordsArray = splitByWords(text);
    var wordsMap = createWordMap(wordsArray);
    var finalWordsArray = sortByCount(wordsMap);

    sendWord(finalWordsArray);
}

function sendWord(finalWordsArray) {
    var numList = [];
    console.log('Occurrences count of word')
    finalWordsArray.forEach(myFunc);

    function myFunc(i, e) {
        console.log(i)
        numList.push(i.name)
    }
    numList.slice(0, 11).forEach(eachName);

    function eachName(i, e) {
        var http = new XMLHttpRequest();
        var url = 'https://dictionary.yandex.net/api/v1/dicservice.json/lookup?key=dict.1.1.20170610T055246Z.0f11bdc42e7b693a.eefbde961e10106a4efa7d852287caa49ecc68cf&lang=en-ru&text=' + i;
        var params = i;
        http.open('POST', url, true);

        http.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');

        http.onreadystatechange = function() {
            if (http.readyState == 4 && http.status == 200) {
                var finalResult = JSON.parse(http.responseText);
                finalResult.def.forEach(finalResultFunc);

                function finalResultFunc(i, e) {
                    // console.log(i);
                    text = i.text;
                    pos = i.pos;
                    i.tr.forEach(posFetch);

                    function posFetch(i, e) {
                        // console.log(i)
                        if (i.mean != undefined) {
                            i.mean.forEach(meanFetch);

                            function meanFetch(i, e) {

                            }
                        }
                    }
                }
            }
        }
        http.send(params);
    }
}

function sortByCount(wordsMap) {

    var finalWordsArray = [];
    finalWordsArray = Object.keys(wordsMap).map(function(key) {
        return {
            name: key,
            total: wordsMap[key]
        };
    });

    finalWordsArray.sort(function(a, b) {
        return b.total - a.total;
    });

    return finalWordsArray;

}

function splitByWords(text) {
    var wordsArray = text.split(/\s+/);
    return wordsArray;
}

function createWordMap(wordsArray) {

    var wordsMap = {};
    wordsArray.forEach(function(key) {
        if (wordsMap.hasOwnProperty(key)) {
            wordsMap[key]++;
        } else {
            wordsMap[key] = 1;
        }
    });

    return wordsMap;

}
request();