In the vast landscape of JavaScript, functions emerge as the architects of modularity and encapsulation. Understanding functions and their associated scope is akin to unlocking the door to code organization and reusability. Let's dive into the fundamentals: Functions: Function Declaration: Functions are defined using the function keyword. Function Expression: Functions can also be assigned to variables. Parameters and Arguments: Functions can accept parameters. Return Statement: Functions can return values. Arrow Functions (ES6+): A more concise syntax for function expressions. Scope: Global Scope: Variables declared outside any function have global scope. Local Scope: Variables declared inside a function have local scope. Block Scope (let and const): Introduced in ES6, let and const have block-level scope. Function Scope (var): Variables declared with var have function-level scope. Lexical Scope (Closures): Functions can access variables from their containing (lexical) scope. ...
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