The answer
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.
JavaScript Arguments Object and Parameters Explained
How do default parameters work in JavaScript?
More FAQs in JavaScript Arguments Object and Parameters Explained
Parameters are variables listed in the function definition. Arguments are the actual values passed to the function when it is called.
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.
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