//map

var upper = _.map(obj, function (value, key) {

    return value.toUpperCase();

});

// every + some

var r1 = _.every(obj, function (value, key) {

    return /^[a-z]*$/.test(key) && /^[a-z]*$/.test(value);

});

var r2 = _.some(obj, function (value, key) {

    return /^[a-z]*$/.test(key) && /^[a-z]*$/.test(value);

});