The answer
Parameters are variables listed in the function definition. Arguments are the actual values passed to the function when it is called.
JavaScript Arguments Object and Parameters Explained
What is the difference between a parameter and an argument in JavaScript?
More FAQs in JavaScript Arguments Object and Parameters Explained
An array-like object available inside regular (non-arrow) functions. It holds the actual arguments passed, indexed by position, with a length property, but no array methods.
No. Arrow functions do not have their own arguments. If you reference arguments inside an arrow, it refers to the arguments of the enclosing regular function. Use rest parameters (...args) in arrows instead.
If the caller passes undefined or omits the argument, the default value is used. Other falsy values like 0, null, or empty string do not trigger the default.
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