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Async utilities and helpers for node

doWhile(mainFn, testFn)

It will execute mainFn() for as long, as conditional testFn() function returns true and then will resolve the promise.

doWhile(mainFn, testFn)
  .then(onResolve, onReject)

failover(func1, func2, ..., funcN)

failover will attempt to execute failover methods in sequence until one of them continues with data. It returns promise that is resolved if at least one of the methods succeeded, and failed otherwise.

failover(method1, method2)
  .then(onResolve, onReject)

Each failover method is expected to have signature method(next), where:

• next(data) is sequence continuation callback takes 0 or 1 parameter
  • data - processed data

Note that unlike other methods next() doesn't take error parameters. It is because failover methods are expected to fail by default

parallel(func1, func2, ..., funcN)

It will execute all function in parallel and resolve promise after all methods completed successfully.

parallel(method1, method2)
  .then(onResolve, onReject)

Each parallel method is expected to have signature method(next), where:

• next(err) is sequence continuation callback takes 0 or 1 parameter
  • error - Error type object

sequence(func1, func2, ..., funcN)

It will execute all function in a sequence and resolve promise after all methods completed successfully.

sequence(method1, method2)
  .then(onResolve, onReject)

Each sequence method is expected to have signature method(next), where:

• next(err, data) is sequence continuation callback takes 0 or 1 parameter
  • error - Error type object