JavaScript for beginners - Chapter 23 - Arguments Object to a function - part 1

JavaScript Arguments Object :
The javascript arguments object is a local variable available within all functions.
An arguments object includes value of each parameter.
The arguments object is an array like object. You can access its values using index similar to array.
The length property of the arguments object returns the number of arguments passed to the function.
We can pass variable number of arguments to a javascript functions. All the parameters will be stored in the arguments object.
An arguments object is still valid even if function does not include any parameters.
An arguments object can be iterated using for loop.

function ShowMessage(firstName, lastName)
{
alert("Hello " + arguments[0] + " " + arguments[1]);
}

ShowMessage("Steve", "Jobs");

ShowMessage("Bill", "Gates");

ShowMessage(100, 200);

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Hello World

[MrDadcard]

how come you did not use for (var i in arguments)?