A Promise implementation in under sixty characters — You’ve heard it before: callbacks don’t compose. I beg to differ. In this article, we will build an abstraction with similar composition and flow control capabilities to Promises, but using only functions that take callbacks — the supposed antithesis of composition. …

The unspoken flaws of JavaScript Promises — A few years ago, JavaScript had a callback problem. The community worked hard to replace callbacks with Promises. Now, JavaScript has a Promise problem. Promises were a big step forward for JavaScript, but unfortunately they have several design flaws. …