JavaScript_Succinctly

funcE.answer = 'yup'; // Instance property.
console.log(funcE.answer); // Logs 'yup'.
It is crucial that you realize a function is an object, and thus a value. It can be passed
around or augmented like any other expression in JavaScript.
Passing parameters to a function
Parameters are vehicles for passing values into the scope of a function when it is
invoked. In the following sample we invoke addFunction(). Since we have predefined
it to take two parameters, two added values become available within its scope.
Sample: sample81.html
var addFunction = function (number1, number2) {
var sum = number1 + number2;
return sum;
}
console.log(addFunction(3, 3)); // Logs 6.
Notes
In contrast to some other programming languages, it is perfectly legal in JavaScript to
omit parameters even if the function has been defined to accept these arguments. The
missing parameters are simply given the value undefined. Of course, by leaving out
values for the parameters, the function might not work properly.
If you pass a function unexpected parameters (those not defined when the function was
created), no error will occur. And it's possible to access these parameters from the
arguments object, which is available to all functions.
this and arguments values are available to all functions
Inside the scope and body of all functions, the this and arguments values are
available.
The arguments object is an array-like object containing all of the parameters being
passed to the function. In the following code, even though we forgo specifying
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