Some tricks with Promise-A+

test-promise.js

var args = { /* ... */ };

someActionThatRetrievesArchPromise()
    .then(function(Arch) {
        var arch = Arch.alterArch();
        return arch
            .invoke.call(Arch, 'createExamplesNodes', args)
            .then(function() {
                return arch;
            });
    })
    .then(function(arch) {
        // do something \w `arch` object
    });