Creating a JavaScript promise from scratch, Part 7: Unhandled rejection tracking

Rejected promises without rejection handlers can hide important errors, which is why both Node.js and browsers have a way of tracking them.

Nicholas C. Zakas

January 19, 2021 • 19 min read

JavaScriptPromisesECMAScript 6

Creating a JavaScript promise from scratch, Part 6: Promise.all() and Promise.allSettled()

Promise.all() and Promise.allSettled() work on any number of promises to allow you to know when all of the promises have resolved

Nicholas C. Zakas

December 16, 2020 • 11 min read

JavaScriptPromisesECMAScript 6

Creating a JavaScript promise from scratch, Part 5: Promise.race() and Promise.any()

Promise.race() and Promise.any() work on any number of promises to allow you to know when certain ones have resolved

Nicholas C. Zakas

November 24, 2020 • 19 min read

JavaScriptPromisesECMAScript 6

Creating a JavaScript promise from scratch, Part 4: Promise.resolve() and Promise.reject()

Promises created with Promise.resolve() and Promise.reject() go through a different process than when created with a constructor.

Nicholas C. Zakas

October 13, 2020 • 8 min read

JavaScriptPromisesECMAScript 6

Creating a JavaScript promise from scratch, Part 3: then(), catch(), and finally()

Promise handlers are where all of the asynchronous actions happens and it helps to look at the internals to understand how they work.

Nicholas C. Zakas

October 6, 2020 • 22 min read

JavaScriptPromisesECMAScript 6

Creating a JavaScript promise from scratch, Part 2: Resolving to a promise

Resolving promises to non-thenables is easy; resolving promises to other promises requires a bit of work.

Nicholas C. Zakas

September 29, 2020 • 7 min read

JavaScriptPromisesECMAScript 6

Creating a JavaScript promise from scratch, Part 1: Constructor

Sometimes it's easier to understand complex concepts like promises by creating them yourself.

Nicholas C. Zakas

September 22, 2020 • 14 min read

JavaScriptPromisesECMAScript 6

ES6 module loading: More complicated than you think

Module JavaScript can be indistinguishable from non-module JavaScript.

Nicholas C. Zakas

April 5, 2016 • 7 min read

JavaScriptECMAScript 6Modules

ECMAScript 6 destructuring gotcha

Nicholas C. Zakas

October 20, 2015 • 4 min read

ECMAScript 6Destructuring

My ECMAScript 7 wishlist

Nicholas C. Zakas

June 3, 2014 • 8 min read

ECMAScript 6ECMAScript 7JavaScript

Creating type-safe properties with ECMAScript 6 proxies

Nicholas C. Zakas

April 29, 2014 • 4 min read

ECMAScript 6JavaScriptProxies

Creating defensive objects with ES6 proxies

Nicholas C. Zakas

April 22, 2014 • 7 min read

ECMAScript 6JavaScriptProxies

Announcing Understanding ECMAScript 6

Nicholas C. Zakas

March 26, 2014 • 7 min read

BooksECMAScript 6JavaScript

Private instance members with weakmaps in JavaScript

Nicholas C. Zakas

January 21, 2014 • 6 min read

ECMAScript 6JavaScriptWeakMap

Understanding ECMAScript 6 arrow functions

Nicholas C. Zakas

September 10, 2013 • 7 min read

ECMAScript 6FunctionsJavaScript

ECMAScript 6 collections, Part 3: WeakMaps

Nicholas C. Zakas

November 6, 2012 • 4 min read

ECMAScript 6JavaScriptWeakMap

Does JavaScript need classes?

ECMAScript 6 adds classes to JavaScript. Do we really neeed them?

Nicholas C. Zakas

October 16, 2012 • 6 min read

ClassesECMAScript 6JavaScript

ECMAScript 6 collections, Part 2: Maps

Nicholas C. Zakas

October 9, 2012 • 7 min read

ECMAScript 6JavaScriptMaps

ECMAScript 6 collections, Part 1: Sets

Nicholas C. Zakas

September 25, 2012 • 6 min read

ArraysECMAScript 6JavaScript

A critical review of ECMAScript 6 quasi-literals

Nicholas C. Zakas

August 1, 2012 • 22 min read

ECMAScript 6JavaScriptQuasis

Thoughts on ECMAScript 6 and new syntax

Nicholas C. Zakas

July 24, 2012 • 10 min read

ECMAScript 6JavaScriptSyntax