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The this keyword in JavaScript (and thus TypeScript) behaves differently than it does in many other languages. This can be very surprising, especially for users of other languages that have certain intuitions about how this should work. This page will teach you how to recognize and diagnose problems with this in TypeScript, and describes several solutions and their respective trade-offs. Typical s
Browser automation revisited - meet Puppeteer I've always been more interested in back-end technologies, scalability, and security. But during the past years, I had my fair share of working on the frontend as well. These stories included testing the UI with functional tests, mostly using Selenium. When it came to that, the team usually went with Nightwatch - if you are interested in how to get sta
JavaScriptで集合演算がしたくて調べてみたら、ECMAScript2015(es6)からbuilt-in objectとしてSetが用意されていることがわかった(MDN Set (日本語版))。集合の定義と要素の追加や削除、イテレータの例は日本語版にあるが、和や積などの集合演算の例は英語版にしか無かった。試してみたのでメモを共有。 集合演算の定義 英語版によると、組み込みでは集合演算は定義されていないので、自分で追加する必要がある。上位集合(Superset)、和(Union)、積(intersection)、差(difference)の例がある。 上位集合(Superset) Set.prototype.isSuperset = function(subset) { for (var elem of subset) { if (!this.has(elem)) { return
Web performance is a crucial aspect of web development that focuses on the speed at which pages load, as well as how responsive they are to user input. When you optimize your website for performance, you're giving users a better experience. The initial release of this course focuses on web performance fundamentals, that beginners should find informative. Each module aims to demonstrate key perform
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