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 don’t fully understand the language. That inner scope is in fact still in use, and thus does not go away. Categories: You Don t Know JS Scope Closuresīut the “magic” of closures does not let this happen. All 6 books are brand new, rewritten to cover all sides of JS for 2020 and beyond.'Scope & Closures' examines all aspects of lexical scope, then builds on these principles to leverage the power of closure, and finally digs into the module pattern for better program structure.

Yet, most developers haven't deeply contemplated how and why these decisions are made and the impacts on code maintainability.The worldwide best selling 'You Don't Know JS' book series is back for a 2nd edition: 'You Don't Know JS Yet'. Scope & Closures, the second book in the new edition series, dives deep into how and why to organize variables into different buckets of scope, limiting scope over-exposure and improving code maintainability.Īre you looking for a better way to deeply learn the fundamentals of JavaScript? Look no further!The foundation of all programs is the organization of its variables and functions into different nested scopes. Learn about scope, a set of rules to help JavaScript engines locate variables in your code Go deeper into nested scope, a series of containers for variables and functions Explore function- and block-based scope, “hoisting”, and the patterns and benefits of scope-based hiding Discover how to use closures for synchronous and asynchronous tasks, including the creation of JavaScript libraries Categories: Computers You Don t Know JS Yet Armed with this knowledge, you can achieve true JavaScript mastery. Like other books in the 'You Don’t Know JS' series, Scope and Closures dives into trickier parts of the language that many JavaScript programmers simply avoid. You’ll learn how and why they work, and how an understanding of closures can be a powerful part of your development skillset.

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