Object Drills

gistfile1.js

// ========= Most frequent word ========= //
/* In this drill, you need to implement a function named mostFrequentWord.
This function takes a single argument, words. Words is an array of lowercase strings,
with punctuation stripped out.
*/

function mostFrequentWord(words) {
    // `words` is an array of strings.
    // Create an empty object to hold most frequent words.
    var wordsObj = {};

    // loop through array indexes
    for (var i; i <= words.length; i++) {
        // if is in obj, loop incrementing by 1, else assign 1
        if (words[i] in wordsObj) {
            wordsObj[words[i]]++;
        } else {
            wordsObj[words[i]] = 1;
        }
    }

    // Return an array. Get first value of first property
    var maxKey = Object.keys(wordsObj)[0];
    var maxCount = wordsObj[maxKey];

    for (var word in wordsObj) {
        if (wordsObj[word] > maxCount) {
            maxKey = word;
            maxCount = wordsObj[word];
        }
    }
    return maxKey;
}

// returns an alphabetically sorted list of words, removing punctuation
// characters
function getTokens(rawString) {
    return rawString.toLowerCase().split(/[ ,!.";:-]+/).filter(Boolean).sort();
}