添加新参数以承诺所有链

Question

I use the following code which is working as expected, Now I need to add the

modifyOpt()

function,currently this is working and in the return I pass args[2] which is working, now I need add additional thing... I need to send the return (which is port) from portscanner.findAPortNotInUseAsync also to modifyOpt() , to be like modifyOpt(port) How should I do that ?

return Promise.all([
    fs.readFileAsync(filePath, 'utf8').then(pars.getEx.bind(null, 'user')), 
    portscanner.findAPortNotInUseAsync(3000, 4000, 'localhost'),
    modifyOpt()

]).then(function(args) {
    return processExe('exec', args[0], args[1],args[2]);
})

Answer 1

Just chain the modifyOpt after the portscanner.findAPortNotInUseAsync(…) promise with then to get the fulfillment value as a parameter.
If you need to use its result twice, just pass the result two times to processExec .

return Promise.all([
    fs.readFileAsync(filePath, 'utf8').then(pars.getEx.bind(null, 'user')), 
    portscanner.findAPortNotInUseAsync(3000, 4000, 'localhost').then(modifyOpt)
]).then(function(args) {
    return processExe('exec', args[0], args[1], args[1]);
})