The answer
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.
Function Parameters and Arguments in JavaScript
What is the difference between rest parameters and the arguments object?
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.
Yes. Spread expands an array into individual arguments. For example, Math.max(...[1, 2, 3]) is the same as Math.max(1, 2, 3).
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