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. 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: Feb 16, 2023 · Function parameters with default values are initialized with default values if they contain no value or are undefined. JavaScript function parameters are defined as undefined by default.
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