Vow

Promises/A+ implementation. See https://github.com/promises-aplus/promises-spec.

Getting Started

###In the Node.js### You can install using Node Package Manager (npm):

npm install vow

###In the Browsers###

<script type="text/javascript" src="vow.min.js"></script>

Also RequireJS module format supported.

API

• Creating promise
• Promise API
  • fulfill
  • reject
  • isFulfilled
  • isRejected
  • isResolved
  • then
  • fail
  • spread
• Vow API
  • when
  • isPromise
  • isFulfilled
  • isRejected
  • isResolved
  • fulfill
  • reject
  • resolve
  • all
  • allResolved
  • any
  • timeout

####Vow.promise()#### Create promise

var promise = Vow.promise();

###Promise API### ####fulfill(value)#### Fulfill promise with given value

var promise = Vow.promise();
promise.fulfill('completed'); // fulfill promise with 'completed' value

####reject(reason)#### Reject promise with given reason

var promise = Vow.promise();
promise.reject(Error('internal error')); // reject promise with Error object

####isFulfilled()#### Returns whether the promise is fulfilled

var promise = Vow.promise();
promise.isFulfilled(); // returns false
promise.fulfill('completed');
promise.isFulfilled(); // returns true

####isRejected()#### Returns whether the promise is rejected

var promise = Vow.promise();
promise.isRejected(); // returns false
promise.reject(Error('internal error'));
promise.isRejected(); // returns true

####isResolved()#### Returns whether the promise is fulfilled or rejected

var promise = Vow.promise();
promise.isResolved(); // returns false
promise.fulfill('completed'); // or promise.reject(Error('internal error'));
promise.isResolved(); // returns true

####then([onFulfilled], [onRejected])#### Arranges for:

• onFulfilled to be called with the value after promise is fulfilled,
• onRejected to be called with the rejection reason after promise is rejected.

Returns a new promise. See Promises/A+ specification for details.

var promise = Vow.promise();
promise.then(
    function() { // to be called after promise is fulfilled
    },
    function() {// to be called after promise is rejected        
    });

####fail(onRejected)#### Arranges to call onRejected on the promise's rejection reason if it is rejected. ####spread([onFulfilled], [onRejected])#### Like "then", but "spreads" the array into a variadic value handler.

promise.spread(onFulfilled, onRejected);

###Vow API###

####when(value, [onFulfilled], [onRejected])#### Static equivalent for promise.then. If given value is not a promise, value is equivalent to fulfilled promise.

####isPromise(value)#### Returns whether the given value is a promise.

Vow.isPromise('value'); // returns false
Vow.isPromise(Vow.promise()); // returns true

####isFulfilled(value)#### Returns whether the given value is fulfilled. If value is not a promise, value is equivalent to fulfilled promise.

####isRejected(value)#### Returns whether the given value is rejected. If value is not a promise, value is equivalent to fulfilled promise.

####isResolved(value)#### Returns whether the given value is resolved (fulfilled or rejected). If value is not a promise, value is equivalent to fulfilled promise.

####fulfill(value)#### Returns a promise that has already been fulfilled with the given value. If value is a promise, returned promise will be fulfilled with fulfill/rejection value of given promise.

####reject(reason)#### Returns a promise that has already been rejected with the given reason. If reason is a promise, returned promise will be rejected with fulfill/rejection value of given promise.

####resolve(value)#### Returns a promise that has already been fulfilled with the given value. If value is a promise, returns promise.

####all(promises)#### Returns a promise to be fulfilled only after all the items in promises is fulfilled, or to be rejected when the first promise is rejected.

####allResolved(promises)#### Returns a promise to be fulfilled only after all the items in promises is resolved.

####any(promises)#### Returns a promise to be fulfilled only any item in promises is fulfilled, or to be rejected when the all items is rejected.

####timeout(promise, timeout)#### Returns a promise to be rejected after a timeout if promise does not resolved beforehand.