Web Reference: Jul 8, 2025 · The function keyword can be used to define a function inside an expression. You can also define functions using the function declaration or the arrow syntax. In JavaScript, function declarations and function expression refer to different ways of defining functions, their different syntax and how they are handled: They both work the same when you call them. Function expressions load only when the interpreter reaches that line of code. So if you try to call a function expression before it's loaded, you'll get an error! If you call a function declaration instead, it'll always work, because no code can be called until all declarations are loaded. Example: Function Expression.
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