async-1-a.js

var Q = require("events");

exports.and = function (a, b) {
    return Q.when(a, function (a) {
        return Q.when(b, function (b) {
            return a && b;
        });
    });
};

Q.when(exports.and(true, true), function (and) {
    print(and);
});

async-1-b.js

var Q = require("events");

exports.and = function (a, b) {
    return Q.when(a, function (a) {
        return Q.when(b, function (b) {
            return a && b;
        });
    });
};

var a = Q.defer();
var b = Q.defer();

Q.when(exports.and(a.promise, b.promise), function (and) {
    print(and);
});

a.resolve(true);
b.resolve(false);

async-2-a.js

var Q = require("events");

exports.and = function (a, b) {
    return Q.when(a, function (a) {
        return Q.when(b, function (b) {
            return a && b;
        });
    });
};

exports.all = function (values) {
    return values.reduce(function (a, b) {
        return exports.and(a, b);
    });
};

Q.when(exports.all([true, true, true]), function (and) {
    print(and);
});

async-2-b.js

var Q = require("events");

exports.and = function (a, b) {
    return Q.when(a, function (a) {
        return Q.when(b, function (b) {
            return a && b;
        });
    });
};

exports.all = function (values) {
    return values.reduce(function (a, b) {
        return exports.and(a, b);
    });
};

var deferred = Q.defer();

Q.when(exports.all([true, deferred.promise, true]), function (and) {
    print(and);
});

deferred.resolve(false);