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How JavaScript Promise Works

Home Page: https://hackernoon.com/implementing-javascript-promise-in-70-lines-of-code-b3592565af0f

License: MIT License

JavaScript 100.00%
javascript promise promise-library functional functional-programming asynchronous

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nancy's Issues

What exactly did callLater do?

I read the asynchronous part (callLater), but couldn’t understand the mechanism. Can you explain it a bit more?

Bug

the code by Promise:

console.log(1)
Promise.resolve(2).then(v=>console.log(v))
console.log(3)
# or
console.log(1)
new Promise(resolve=>resolve(2)).then(v=>console.log(v))
console.log(3)

will console 1 3 2

but the code by Nancy

console.log(1)
Nancy.resolve(2).then(v=>console.log(v))
console.log(3)
# or
console.log(1)
new Nancy(resolve=>resolve(2)).then(v=>console.log(v))
console.log(3)

will console 1 2 3

Consider testing against Promise A+ spec's conformation tests

This is an awesome great functional implementation that uses state machine!
Many other implementations use too much repeated if checks.

It would greater if Nancy can pass all the Promise A+ spec tests: https://github.com/promises-aplus/promises-tests

One place where Nancy breaks is when empty then are chained. e.g.

const a = new Nancy((resolve, reject) => {
    setTimeout(() => {
      resolve('123');
    }, 1000);
  })
    .then()
    .then((value) => {
      console.log(value);
    });

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