Message from JavaScript discussions

July 2017

— I am trying some Aspect Oriented Programming with Promises, but I am not sure how to automate the promise chain

—

An Aspect looks like this

Aspect.prototype.execute = function (state) {
  return Promise.resolve(state)
    .then(this.enter)
    .catch(this.errorHandler)
    .then(this.main)
    .catch(this.errorHandler)
    .then(this.exit)
    .catch(this.errorHandler);
};

— And then I try chaining like this

function Strategy(...aspects) {
  this.aspects = aspects;
}
Strategy.prototype.execute = function (...arguments) {
  var curAspect = this.aspects[0].execute(arguments);
  for (var loc = 1; loc < this.aspects.length; loc++) {
    curAspect = curAspect.then(this.aspects[loc].execute);
  }
};

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— Since then is a cw/cs function it is good for AOP I think

— But looking at that for loop do you think that is a good way to chain?

— Uhm

—

promises.reduce((final, promise) =>
  final.then(promise), Promise.resolve(state));

— Oh drerp I forgot about the high order array functions

— Heh

— Thank you haha

— This will allow two algorithms, diff and clone to be used to make diffClone without changing them at all

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— Ooooh