gistfile1.js

var _global = this;

 (function() {
    function Logger(logLevel) {
        this.logLevel = logLevel;
    }
    _global.Logger = Logger;

    Logger.LEVEL_DEBUG = 0;
    Logger.LEVEL_INFO = 1;
    Logger.LEVEL_WARN = 2;
    Logger.LEVEL_ERROR = 3;

    Logger.prototype.logLevel = Logger.LEVEL_DEBUG;
    Logger.prototype._dummy = function() {
        return false;
    };
    Logger.prototype._debug = Logger.prototype._dummy;
    Logger.prototype._info = Logger.prototype._dummy;
    Logger.prototype._warn = Logger.prototype._dummy;
    Logger.prototype._error = Logger.prototype._dummy;
    try {
        Logger.prototype.debug = (this.logLevel > Logger.LEVEL_DEBUG) ? this._dummy: console.debug;
        Logger.prototype.info = (this.logLevel > Logger.LEVEL_INFO) ? this._dummy: console.info;
        Logger.prototype.warn = (this.logLevel > Logger.LEVEL_WARN) ? this._dummy: console.warn;
        Logger.prototype.error = (this.logLevel > Logger.LEVEL_ERROR) ? this._dummy: console.error;
    } catch(e) {
        Logger.prototype.debug = Logger.prototype._debug;
        Logger.prototype.info = Logger.prototype._info;
        Logger.prototype.warn = Logger.prototype._warn;
        Logger.prototype.error = Logger.prototype._error;
    }
})();