The arguments.length
property contains the number of arguments passed to the function.
Description
The arguments.length property provides the number of arguments actually passed to a function. This can be more or less than the defined parameter's count (see Function.length
).
Examples
Using arguments.length
In this example we define a function that can add two or more numbers together.
function adder(base /*, n2, ... */) {
base = Number(base);
for (var i = 1; i < arguments.length; i++) {
base += Number(arguments[i]);
}
return base;
}
Note the difference between Function.length
and arguments.length
Specifications
Specification |
---|
ECMAScript (ECMA-262) The definition of 'Arguments Exotic Objects' in that specification. |
Browser compatibility
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