The answer
The extra arguments are ignored by the named parameters, but they are still accessible through the arguments object or a rest parameter. Missing arguments become undefined.
Function Parameters and Arguments in JavaScript
What happens if you pass more arguments than parameters in JavaScript?
More FAQs in Function Parameters and Arguments in JavaScript
Parameters are the variable names listed in the function definition. Arguments are the actual values passed to the function when it is called.
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.
Rest parameters (...args) collect remaining arguments into a true array with methods like map and filter. arguments is array-like (has length and indices) but lacks array methods, and is not available in arrow functions.
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