<ul><li>JavaScript has three main types of scope: global, function, and block.</li><li>Global scope is accessible everywhere, while function scope is created by functions.</li><li>Block scope, applicable to let and const, is defined by code blocks like if, for, and while.</li><li>Variables declared with var have function scope and are discouraged in modern JavaScript.</li><li>Understanding scopes is crucial to prevent bugs and prepare for concepts like closures.</li><li>Inner scopes have access to outer scopes, but not vice versa.</li><li>Scopes are temporary, disappearing once a function finishes running.</li><li>let and const are block-scoped, var is function-scoped, and const variables cannot be reassigned.</li><li>Scopes in JavaScript play a vital role in defining accessibility and lifespan of variables and functions.</li><li>Having a clear grasp of scopes is essential for writing robust and bug-free JavaScript code.</li></ul>

Do you know how it works? - JS Scopes

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