asyncbuilder

• builds an array containing a mix of immediate and async results
• follows node convention of using callbacks with signature cb(err, results)
• useful for building a sequential list in the order that async operations are invoked

install

    npm install asyncbuilder

usage

// new is optional
var ab = new asyncbuilder(mainCallBack);

// call any number of times... for sync
ab.append(something);

// or for async
var cb = ab.asyncAppend();  // returns callback
someAsyncOperation(cb);

// call this at least once
ab.complete();

• no mainCallBack() will happen until you issue a complete()

• mainCallBack(null, results) is invoked once after the last cb() with no errors.

• mainCallBack(err) is invoked once after the first cb(err).

• the original order of append() and asyncAppend() operations is respected in the results, even if asyncAppend results arrive out of order.

• if there are only append operations, or no appends at all, complete() will trigger mainCallBack() on nextTick.

• calling append() or asyncAppend() after complete() will result in an error.

note

• it doesn't make sense to call asyncAppend() from within an async operation. Ordering will be wrong, and complete() will probably have been called already. Instead, call asyncAppend() before the async operation and pass the function returned by asyncAppend() as the operation's async callback

license

(c) 2015-2021 Jürgen Leschner, MIT license