Is an arrow function a declaration or an expression?
Always an expression. Arrow functions are always assigned to a variable. They are hoisted as variables, not as functions, and they do not have their own this or arguments.
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More FAQs in Function Declarations vs Function Expressions in JavaScript
A function declaration is hoisted with its full body, so it can be called before its line. A function expression is assigned to a variable, which is hoisted (undefined with var, TDZ with let/const) but the function body is only assigned at the line.
No. With var, calling it early throws TypeError because the variable is undefined. With let or const, it throws ReferenceError because the variable is in the Temporal Dead Zone.
A function expression with an internal name, like const greet = function sayHi() {}. The internal name is only visible inside the function, useful for recursion and better stack traces. Outside, you use the variable name.
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