Web Reference: Jul 8, 2025 · The default parameter allows any expression, but you cannot use await or yield that would pause the evaluation of the default expression. The parameter must be initialized synchronously. 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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