Method for converting a natural language ordinal to a numerical value. Given an array, first = 1, second = 2, last = arr.length

wordToNumber.js

CommonManager = {
    wordToNumber: function(word, arr) {
        var dict = {
            'first': 1,
            'second': 2,
            'third': 3,
            'fourth': 4,
            'fifth': 5,
            'sixth': 6,
            'seventh': 7,
            'eighth': 8,
            'ninth': 9,
            'tenth': 10,
            'last': arr ? arr.length : null,
            '1st': 1,
            '2nd': 2,
            '3rd': 3,
            '4th': 4,
            '5th': 5,
            '6th': 6,
            '7th': 7,
            '8th': 8,
            '9th': 9,
            '10th': 10
        };

        return word ? dict[word.toLowerCase()] : null;
    }
};