termFrequency.js

function termFrequency(document){
    // calculates term frequency of each sentence
    words_without_stopwords = prettify(document);
    
    // gets rid of trailing spaces
    const sentences = document.split(".").map(item => item.trim());
    sentences[0] = sentences[0].substring(146);

    const TFVals = countWords(words_without_stopwords)
    const unique_words = uniqueWords(words_without_stopwords);

    // actually makes it TF values according to formula
    for (const [key, value] of Object.entries(TFVals)){
        TFVals[key] = TFVals[key] / words_without_stopwords.length;
    }