So naturally, JavaScript has a module system. One of the most basic things you need is a module system, a way to spread your work across multiple files and directories-but still make sure all your bits of code can access one another as needed-but also be able to load all that code efficiently. JavaScript projects have grown to jaw-dropping sizes, and the community has developed tools for working at scale. Not long before that, the predominant use of JavaScript had been form validation, and sure enough, your average handler would be… one line of code. This was two years after Google Maps launched. When I started on Mozilla’s JavaScript team back in 2007, the joke was that the length of a typical JavaScript program was one line. ES6 In Depth is a series on new features being added to the JavaScript programming language in the 6th Edition of the ECMAScript standard, ES6 for short.
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