Function declarations are a classic way to define functions in JavaScript using the `function` keyword followed by name and parameters. They offer readability, scope, and hoisting benefits, making them versatile for reusable code, event handling, and modular code organization.
Mastering JavaScript functions, scope, and closures underpins robust frontend code: functions enable modularity and reuse; scope governs variable access; closures capture outer state for callbacks, HOFs, and IIFEs. Understanding their interplay improves architecture, performance, and memory use (e.g., weather-fetch closure), and is foundational for advanced techniques.
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