dot-separated version number comparison

var Util = {
    versionString: '0.12.0.1', // Change this manually each version, or (better) assign Util.versionString from config or build script
    isOlderThan: function (thresholdVersionString) {
        return (Util.versionStringToFloat(Util.versionString) < Util.versionStringToFloat(thresholdVersionString));
    },
    // Converts a string of form '1.4.2' to an easily comparable decimal number 
    // Assumes sub-enumeration cannot reach 1000
    versionStringToFloat: function (versionString) {
        var splitVersion = versionString.split('.'),
            maxEnumeration = 1000;
        return _.reduceRight( // I used underscore.js, but it's a standard implementation
            versionString.split('.'), 
            function (total, subEnumeration) {
                subEnumeration = +subEnumeration; // Convert from string to number
                total /= maxEnumeration; 
                total += subEnumeration; 
                return total;
            }, 
            0 // initial value for total
        );
    }
}