function getItemsFromJSONData(data, wordtype)
            {
                var items = new LinkedList();

                console.log(Object.keys(data[0]));
                console.log(data[0].tags);

                if(wordtype == "*")
                {
                    for(var i = 0, length = data.length; i < length; i++)
                        if(frequencyMeetsRequirement(data.tags))
                            items.add(data[i].word);
                }
                else
                {
                    for(var i = 0, length = data.length; i < length; i++)
                        if(frequencyMeetsRequirement(data.tags))
                            if(arrayContains(data[i].tags, wordtype))
                                items.add(data[i].word);
                }

                return items;
            }

            const frequencyRequirement = 0.35;

            function frequencyMeetsRequirement(tags)
            {
                console.log(tags)

                for(var i = 0, tag = tags[0]; i < tags.length; tag = tags[++i])
                {
                    if(tag.startsWith("f:"))
                    {
                        var numString = tag.substring(2, tag.length);
                        var num = parseFloat(numString);
                        return num >= frequencyRequirement;
                    }
                }

                return false;
            }

Console log:

Array [ "word", "score", "numSyllables", "tags" ]  script.html:52:5
Array [ "n", "adj", "v", "f:151.019815" ]  script.html:53:5
undefined  script.html:76:5
Array [ "word", "score", "numSyllables", "tags" ]  script.html:52:5
Array [ "v", "n", "f:5.154289" ]  script.html:53:5
undefined  script.html:76:5
Array [ "word", "score", "numSyllables", "tags" ]  script.html:52:5
Array [ "adj", "f:1.479037" ]  script.html:53:5
undefined  script.html:76:5
TypeError: tags is undefined[Learn More] script.html:78:20 (That's line 31 in this paste)