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You Don't Know JS: Async & Performance. K. Simpson



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 JavaScript is awesome. It's easy to learn partially, and much harder to learn completely (or even sufficiently). When developers encounter confusion, they usually blame the language instead of their lack of understanding. These books aim to fix that, inspiring a strong appreciation for the language you can now, and should, deeply know.
 Note: Many of the examples in this book assume modern (and future-reaching) JavaScript engine environments, such as ES6. Some code may not work as described if run in older (pre-ES6) engines.
 Over the years, my employer has trusted me enough to conduct interviews. If we're looking for someone with skills in JavaScript, my first line of questioning… actually that's not true, I first check if the candidate needs the bathroom and/or a drink, because comfort is important, but once I'm past the bit about the candidate's fluid in/out-take, I set about determining if the candidate knows JavaScript, or just jQuery.
 Not that there's anything wrong with jQuery. It lets you do a lot without really knowing JavaScript, and that's a feature not a bug. But if the job calls for advanced skills in JavaScript performance and maintainability, you need someone who knows how libraries such as jQuery are put together. You need to be able to harness the core of JavaScript the same way they do



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