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. Parameter Rules JavaScript function definitions do not specify data types for parameters. JavaScript functions do not perform type checking on the arguments. JavaScript functions do not check the number of arguments received. I would like a JavaScript function to have optional arguments which I set a default on, which get used if the value isn't defined (and ignored if the value is passed).
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