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promise-sugar

v2.3.3

Published

Promise syntactic sugar - promise chains without write ".then"

Downloads

32

Readme

Promise syntactic sugar Build Status

No need to write .then in your promise chains. The promise is the .then function itself!

What it does

1 ) It allows you to convert this

Promise.resolve(10)
.then((n) => n / 2)
.then((n) => n * 3)
.then(log) // -> 15
.catch(logError)

into this

sweeten(10)
((n) => n / 2)
((n) => n * 3)
(log) // -> 15
(null, logError) // or .catch(logError)

2 ) and this

// Given two existing promises A and B
// wait for A and B and return B's value
log(await A.then(() => B)) // -> B's value

into this

log(await A(B)) // -> B's value

where

const log      = console.log.bind(console);
const logError = console.error.bind(console);

That's almost it! For More sugar see below.

A sweeten promise is still a thenable. Thus you can still await for it, or you could swap the Promise with the sweeten version in your old code and it should still work the same.

Promise-sugar tries to preserve all other behaviors of the Promise library used.

There is another library that implements a similar paradigm - thunks.

Thunks is different from Promise-sugar and more complex (a thunk is not a promise and it has no .catch() method).

You can play with it on jsBin

Install

  • Copy promise-sugar.js to your project or install it using npm:
npm install promise-sugar --save
  • Import promise-sugar.js into your app using import (ESM), require (AMD or CommonJs) or as a script tag.
import sweeten from 'promise-sugar';
const sweeten = require('promise-sugar');
<script src="https://unpkg.com/promise-sugar"></script>
  • Make sure there is a Promise implementation or get a polyfill like es6-promise.
sweeten.usePromise(require('es6-promise').Promise); // polyfill

More sugar

Regardless of the Promise implementation used, all sweeten promises have the following methods:

sweeten(promise)
    .catch(onReject)   // Promite/A+
    .finally(callback) // not a Promise/A+ method
    .timeout(1000)     // reject in 1 sec, not a Promise/A+ method

If Promise.prototype.progress is defined, Promise-sugar will preserve it.

Here are some helper methods of Promise-sugar:

sweeten.when(value_or_thenable); // creates a sweeten promise
let deferred = sweeten.defer();  // creates a deferred with a sweeten .promise

sweeten.allValues(obj);          // Similar to Promise.all(list), but accepts an object with thenable values

if(sweeten.isThenable(any)) any.then(doStuff);

let waiter = sweeten.wait(123);  // setTimeout()
waiter.then(doStuffLater);
waiter.stop();                   // don't doStuffLater() (like clearTimeout())


function sum(a,b) { return a + b; }
let ssum = sweeten.fn(sum); // sweeten version of sum()
ssum(2, Promise.resolve(3))(log); // -> 5


// Promise/A+ sweet equivalents
sweeten.resolve(val)
sweeten.reject(val)
sweeten.race(list)
sweeten.all(list)
sweeten.any(list)
sweeten.allSettled(list)

Examples

Sweeten promises are just promises and functions (thens) at the same time:

let result = sweeten(fetch('/my/api'))
             ((res) => res.json())
;

// Now you have a simple function that contains your result
result(log);

// and it is still a promise!
result.catch(logError);

// and can be used as such
Promise.all([result, fetch('my/api/something/else')])
.then(/*...*/);

// or equivalent of the above
sweeten.all([result, fetch('my/api/something/else')])
(/*...*/);

Sweeten promise constructor:

let myStuff = new sweeten(function (resolve, rejext){
    setTimeout(resolve, 100, Math.random());
});

myStuff((myNumber) => {/*...*/}, (error) => {/*...*/});