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Promise.all() doesn't guarantee that promises will be resolved in order. How can this be done? Benjamin Gruenbaum Since you're using Bluebird JS, this can be actually done in a simple way. In version 2.0, Bluebird introduced the Promise.each method that does this, for looping a then is simple enough, but since it is so common and got requested time after time eventually it was added as its own method. function foo(item, ms){ // note bluebird has a delay method return Promise.delay(ms, item).then(console.log.bind(console)) } var items = ['one', 'two', 'three']; Promise.each(items, function(item

I'm using Qt and bash over it, need to execute something like: bash: cat file | grep string in Qt: QString cmd = "cat file | grep string"; QProcess *process = new QProcess; process->start(cmd); process->waitForBytesWritten(); process->waitForFinished(); qDebug() << process->readAll(); The problem is in pipe ("|"), and process returs nothing. If there is no ("|"), like "cat file" everything is ok. I tried smth. like "cat file \\| grep string", "cat file \| grep string" but result is the same. If I copy the command and run it in bash everything is ok. QString::toAscii().data() and other

chain.doFilter(req,res); We used this in a servlet program. I want to know what is the use of the method doFilter() in a servlet? Also what is the use of filter and chain concept in Java servlets? Servlet filters are implementation of the chain of responsibility pattern The point is that each filter stays "in front" and "behind" each servlet it is mapped to. So if you have a filter around a servlet, you'll have: void doFilter(..) { // do stuff before servlet gets called // invoke the servlet, or any other filters mapped to the target servlet chain.doFilter(..); // do stuff after the servlet

Lets imagine function like this: function foo(x) { x += '+'; return x; } Usage of it would be like: var x, y; x = 'Notepad'; y = foo(x); console.log(y); // Prints 'Notepad+'. I'm looking for a way to create function that's chainable with other functions. Imagine usage: var x, y; x = 'Notepad'; y = x.foo().foo().toUpperCase(); // Prints 'NOTEPAD++'. console.log(y); How would I do this? Sure, the trick is to return the object once you're done modifying it: String.prototype.foo = function() { return this + "+"; } var str = "Notepad"; console.log(str.foo().foo().toUpperCase()); http://jsfiddle.net

I've been running into a couple of problems with javascript promises, particularly with stacked chains. Can anyone explain to me the difference (if there is any!) between these different implementations? IMPLEMENTATION 1 var serverSidePromiseChain; serverSidePromiseChain = async().then(function(response) { console.log('1', response); return response; }).then(function(response) { console.log('2', response); return true; }).then(function(response) { console.log('3', response); // response expected to be 'true' return async3(); }).then(function(response) { console.log('4', response); return