# Red and Blue Function Mistakes in JavaScript Bob Nystrom's [What Color is Your Function](https://journal.stuffwithstuff.com/2015/02/01/what-color-is-your-function/) does an amazing job of describing why it can be painful when programming languages have different rules for calling synchronous and asynchronous functions. Promises and async/await have simplified things in JavaScript, but it's still a language with "red" (async) and "blue" (sync) functions, and I consistently see a few understa...
