PromiseA

Useage

// useage 1
var read = function(path) {
 var p = Promise();
 
 fs.readFile(path, function(err, data) {
 if(!err) p.resolve(data);
 else p.reject(err);
 });
 
 return p;
};
// useage 2
var write = function(data) {
 return Promise(function(resolve, reject) {
 fs.writeFile('bar.js', function(err) {
 if(!err) resolve();
 else reject(err);
 });
 });
};
// useage 3
var sleep = function(ms) {
 return function(v) {
 var p = Promise();
 setTimeout(function() {
 p.resolve(v);
 }, ms);
 return p;
 };
};
read('foo.js')
 .then(sleep(1000))
 .then(write)
 .then(sleep(1000))
 .then(function() {
 console.log('done!');
 });

API list

constructor

instance methods

static methods

Idea About Promise

Licence