Web Reference: Dec 2, 2011 · You should use undefined instead of optional parameter you want to skip, because this 100% simulates the default value for optional parameters in JavaScript. Small example: //is equivalent to myfunc(param, undefined, undefined, undefined); Technically, in JavaScript, all arguments are optional. However, if a function defines argument names, either every argument must be supplied or the first n parameters passed in the call will be assigned to the first n labels in the definition. Nov 3, 2025 · Optional parameters in JavaScript let functions work even when some arguments are not provided, making them more flexible and reusable. Missing parameters are automatically set to undefined or a default value. You can define default values directly in the function definition.
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