Check out the article, the code and the commit history.
Tests use asyncCounter
, perhaps another good read.
How JavaScript Promise Works
Home Page: https://hackernoon.com/implementing-javascript-promise-in-70-lines-of-code-b3592565af0f
License: MIT License
Check out the article, the code and the commit history.
Tests use asyncCounter
, perhaps another good read.
I read the asynchronous part (callLater), but couldn’t understand the mechanism. Can you explain it a bit more?
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
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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