- A code snippet that can be called by other code or by itself, or a variable that refers to the function. When a function is called, arguments are passed to the function as input, and the function can optionally return a value. A function in JavaScript is also an object. A function name is an identifier included as part of a function declaration or function expression. The function name’s scope depends on whether the function name is a declaration or expression. ← MDN Web Docs
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