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In this episode, Wes and Scott discuss concerts, getting tired, landscaping, gym updates, awful search engines, Linus Tech Tips ethics, rewiring engines, and what they're streaming. They cover closures in JavaScript, understanding scope, dynamic scoping, and the applications of closures in functional programming and object-oriented programming.
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Quick takeaways
- JavaScript has global scope, local scope, and closure scope, with variables declared in global scope accessible anywhere in the application.
- Closures in JavaScript have advantages such as creating private variables and state, preventing variable leaks in modules, and enabling asynchronous workflows with wait conditions.
Deep dives
Understanding Scope in JavaScript
JavaScript has global scope, local scope, and closure scope. Variables declared in global scope can be accessed anywhere in the application. Local scope is created within blocks of code like functions or if statements, where variables are not accessible outside of those blocks. Closures, on the other hand, occur when functions are created inside other functions, allowing the inner function to access variables from the outer function even after the outer function has completed. Closures are useful for maintaining private variables and state.
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