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Function.arguments.length
Specifies the number of arguments passed to the function.
Property of Function.arguments local variable; Function (deprecated)
Description
arguments.length is a property of the Function.arguments local variable available within all function objects; arguments.length as a property of Function is no longer used.
arguments.length provides the number of arguments actually passed to a function. By contrast, the Function.length property indicates how many arguments a function expects.
Example
The following example demonstrates the use of Function.length and arguments.length.
If you pass more than two arguments to this function, the function returns 0: