gistfile1.txt

var truthiness = function(obj) {
        /* ?P -> Boolean */
        switch(obj) {
            case 0:
            case false:
            case null:
            case undefined:
                return false;
            case true:
                return true;
        }
        if (typeof(obj) === 'string') {
            return /[^\s]/.test(obj);
        }
        if (_.isNumber(obj)) {
            return true;
        }
        if (obj.length !== undefined) {
            return obj.length > 0;
        }
        for (var k in obj) {
            if (obj.hasOwnProperty(k)) {
                return true;
            }
        }
        if (obj.nodeType) return true;
        return false;
    };