stringToNumber.js

function stringToNumber(value) {
    /**
     * Interesting facts about JavaScript:
     *
     * 1. NaN != NaN
     * 2. If you pass a string to parseFloat(), it returns NaN
     *
     * These facts can be exploited to convert string numbers into numbers.
     */
    var floatValue = parseFloat(value);
    return floatValue != floatValue ? value : floatValue;
}