Using callback-passing for asynchronous actions does not compose well and creates complex flows of passing callbacks around. The JavaScript community has produced several libraries to cope with this.

We will discuss below the difference between blocking, inline, synchronous (sync), asynchronous (async) and deferred scripts and how to fix JavaScript problems, but first we’ll look at how to spot ...

Synchronous file handling makes for simpler code, but asynchronous file handling offers more opportunity for platform-level optimization because it doesn’t block execution.

The WebAssembly JavaScript Promise Integration API suspends a Wasm application when it issues a synchronous API call and resumes it when the asynchronous I/O operation is completed.