Error while building hash map in TagPies.js for certain key terms

[idea-launch-lab]

While testing TagPies with a document corpus I found that building the hash map prioHash in TagPies.js file can have issues when word.key conflicts with JavaScript standard attributes for Array object.

In code below when word.key = "length" or one of the other JS attributes for arrays (like 'map', 'slice', etc.) then the line if(typeof prioHash[word.key] == "undefined") returns false even though the key is not present in prioHash, resulting in error in the subsequent line prioHash[word.key].push(word);

My first and rather basic solution is to create a list of possible conflict terms and catch them before testing the hash map. I modify the terms by adding a space at end to avoid the conflict.

        // var problemTerms = ['length', 'map', 'filter', 'slice', 'sort'];
    for(var i = 0; i < tags1.length; i++) {
        var word = tags1[i];
        globalHash[word.id] = word;
        //if (problemTerms.indexOf (word.key) > -1) {
        //  word.key += ' ';
        //  //console.log ("!!! problem term: " + word.key);
        //}

        if(typeof prioHash[word.key] == "undefined") {
            prioHash[word.key] = [];
            freqHash[word.key] = 0;
        }
        prioHash[word.key].push(word); // Error here if word.key is one from problemTerms
        freqHash[word.key] += word.value;
        if(word.value > maxFreq) {
            maxFreq = word.value;
        }
        if(word.value < minFreq) {
            minFreq = word.value;
        }
    }

Thanks.