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You Don't Know JS: Scope & Closures
This Book is an excerpt from Kyle Simpson's book, "You Don't Know JS: Scope & Closures" which comprehensively explains JavaScript scope and closures. The excerpt includes a foreword and preface discussing the challenges and complexities of mastering JavaScript, emphasizing the importance of deep understanding rather than superficial knowledge. The main body provides a detailed explanation of scope, differentiating between lexical and dynamic scope, and illustrating how the compiler handles variable declarations and assignments through a process called hoisting. Finally, the excerpt thoroughly examines closures, explaining how functions maintain access to their lexical environment even when executed outside of it, and how this concept underlies various programming patterns like modules.
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Published on 1 month, 3 weeks ago