Web Reference: Jul 8, 2025 · The default parameter initializers live in their own scope, which is a parent of the scope created for the function body. This means that earlier parameters can be referred to in the initializers of later parameters. 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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