#You dont know js hoisting how to#
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#You dont know js hoisting series#

Perhaps one of the most widespread and persistent mistruths about JavaScript is that the this keyword refers to the function it appears in.

#You dont know js hoisting code#

The module pattern is perhaps the most prevalent code organization pattern in all of JavaScript deep understanding of it should be one of your highest priorities. One important application of closure is the module pattern, as we briefly introduced in this book in Chapter 2. Closure is perhaps the single most important concept in all of JS, but if you havenвЂ™t first grasped firmly how scope works, closure will likely remain beyond your grasp. This critical understanding of вЂњlexical scopeвЂќ is what we then base our exploration of closure on for the last chapter of the book. Along the way, we see the typical metaphor for JS variable scope management, вЂњHoisting.вЂќ So we use some deeper understanding of the compilerвЂ™s approach to our code to understand how it finds and deals with variable and function declarations. The JS engine compiles your code right before (and sometimes during!) execution. The Scope & Closures title starts by debunking the common misconception that JS is an вЂњinterpreted languageвЂќ and therefore not compiled. ItвЂ™s not enough to have anecdotal fuzzy beliefs about scope. Perhaps one of the most fundamental things youвЂ™ll need to quickly come to terms with is how scoping of variables really works in JavaScript.

#You dont know js hoisting how to#

IвЂ™m going to use this final chapter to briefly summarize what to expect from the rest of the books in the series, and how to most effectively go about building a foundation of JS learning on top of YDKJS. It challenges you to go beyond your comfort zone and to ask the deeper вЂњwhyвЂќ questions for every single behavior you encounter.

#You dont know js hoisting series#

The You DonвЂ™t Know JS ( YDKJS) series stands in stark contrast to the typical approaches to learning JS, and is unlike almost any other JS books you will read. This is not a good thing, and itвЂ™s not something we should continue to allow to be the norm. Serious developers in other languages expect to put in the effort to learn most or all of the language(s) they primarily write in, but JS developers seem to stand out from the crowd in the sense of typically not learning very much of the language. What is this series all about? Put simply, itвЂ™s about taking seriously the task of learning all parts of JavaScript, not just some subset of the language that someone called вЂњthe good parts,вЂќ and not just whatever minimal amount you need to get your job done at work.

View on GitHub You DonвЂ™t Know JS: Up & Going Chapter 3: Into YDKJS Armed with this knowledge, you can achieve true JavaScript mastery.You DonвЂ™t Know JS: Up & Going | You-Dont-Know-JS You-Dont-Know-JS A fork of book series on JavaScript. Like other books in the 'You DonвЂ™t Know JS' series, Scope and Closures dives into trickier parts of the language that many JavaScript programmers simply avoid. YouвЂ™ll learn how and why they work, and how an understanding of closures can be a powerful part of your development skillset. This concise yet in-depth guide takes you inside scope and closures, two core concepts you need to know to become a more efficient and effective JavaScript programmer. No matter how much experience you have with JavaScript, odds are you donвЂ™t fully understand the language.