Web Reference: Jul 8, 2025 · In JavaScript, function parameters default to undefined. However, it's often useful to set a different default value. This is where default parameters can help. In the following example, if no value is provided for b when multiply is called, b 's value would be undefined when evaluating a * b and multiply would return NaN. Parameters vs. Arguments In JavaScript, function parameters and arguments are distinct concepts: Parameters are the names listed in the function definition. Arguments are the real values passed to, and received by the function. This tutorial teaches you how to use JavaScript default parameters for functions and shows you various examples of functions that use default parameters.
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