Web Reference: Jul 8, 2025 · Default function parameters allow named parameters to be initialized with default values if no value or undefined is passed. This tutorial teaches you how to use JavaScript default parameters for functions and shows you various examples of functions that use default parameters. Learn how to set default parameter values for JavaScript functions. If a function in JavaScript is called with missing arguments (less than declared), the missing values are set to undefined. Sometimes this is acceptable, but sometimes it is better to assign a default value to the parameter:
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