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Functions are the most foundational building block in JavaScript. Not only do they hold the logic of our applications, they also are the primitives upon which we build other programmatic constructs in JavaScript like classes and modules. JavaScript provides different ways to declare and use functions, each with their own nuances and limitations, so given that they are such a fundamental part of the language it is important that you are aware of these characteristics when you are writing JavaScript applications. Welcome to another step in your journey to JavaScript mastery! Let’s get started!