const button = document.querySelector('button') īutton. Even in its first years, the language had exceptions to this rule, though they were a few and you might know them already: HTTP Requests, DOM events and time intervals. Synchronous Execution And The Observer PatternĪs mentioned in the introduction, JavaScript runs the code you write line by line, most of the time. Yield a promise to combine promise and generator. First is its synchronous nature, which means the code will run line after line, almost as you read it, and secondly that it is single-threaded, only one command is being executed at any time.Īs the language evolved, new artifacts appeared in the scene to allow asynchronous execution developers tried different approaches while solving more complicated algorithms and data flows, which led to the emergence of new interfaces and patterns around them. Its no secret if youve written any significant amount of JavaScript that asynchronous programming is a required skill. JavaScript has two main characteristics as a programming language, both important to understand how our code will work. We will start with the beginnings of web development, and go all the way to modern asynchronous pattern examples. Tackle program-level performance with Web Workers, SIMD, and asm.In this article, we are going to explore the evolution of JavaScript around asynchronous execution in the past era and how it changed the way we write and read code.
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