Default Parameters In Javascript Javascript Cywahg0UHyU

Web Reference: Jul 8, 2025 · Description 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. 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: The default value of a function parameter is "undefined" in JavaScript. When a function is called with missing arguments the parameters are set to 'undefined'. The undefined parameter values are acceptable but can generate unusual outcomes.

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