mahhov/promise-w

PromiseW

Thin wrapper over standard promise that adds 3 bool getters (done, resolved, rejected) and resolve and reject functions.

API

proimseW.constructor([function executor])

Similar to a traditional promise constructor, except executor is optional.

bool proimseW.done

Returns true if either resolve or reject have been invoked.

bool proimseW.resolved

Returns true if resolve has been invoked before reject was invoked.

bool proimseW.rejected

Returns true if reject has been invoked before resolve was invoked.

void promiseW.resolve(value)

Resolves promiseW with value iff done is false; i.e. neither resolve nor reject been invoked yet.

void promiseW.reject(value)

Rejects promiseW with value iff done is false; i.e. neither resolve nor reject been invoked yet.

PromiseW.then(function handler)

Same as promise.then. done, resolved, and rejected will be updated prior to invoking the handler.

promiseW.catch(function handler)

Same as promise.catch. done, resolved, and rejected will be updated prior to invoking the handler.

Examples

let promiseW = new PromiseW();
console.log(promiseW.done, promiseW.resolved, promiseW.rejected); // false, false, false 

promiseW.resolve(5);
console.log(promiseW.done, promiseW.resolved, promiseW.rejected); // true true, false 

// PromiseW will prevent simple corruption.
proimseW.reject(3);
promiseW.resolved = false;
promiseW.rejected = true;
console.log(promiseW.done, promiseW.resolved, promiseW.rejected); // true true, false