Web Reference: Jul 8, 2025 · Default function parameters allow named parameters to be initialized with default values if no value or undefined is passed. With ES6, you can do perhaps one of the most common idioms in JavaScript relates to setting a default value for a function parameter. The way we’ve done this for years should look quite familiar: 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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