Web Reference: The first function (the commented one) will generate an error because the optional parameter "a" was before the required parameter "b." But the second definition would definitely work. Default function parameters allow named parameters to be initialized with default values if no value or undefined is passed. 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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