In Chapter 2, Primitive Data Types, Arrays, Loops, and Conditions, you saw that there are five primitive data types (number, string, Boolean, null, and undefined), and we also said that everything that is not a primitive piece of data is an object. Now, you also know that:
Objects are like arrays, but you specify the keys
Objects contain properties
Properties can be functions (functions are data; remember
var f = function () {};). Properties that are functions are also called methodsArrays are actually objects with predefined numeric properties and an auto-incrementing
lengthpropertyArray objects have a number of convenient methods (such as
sort()orslice())Functions are also objects, and they have properties (such as
lengthandprototype) and methods (such ascall()andapply())
Regarding the five primitive data types, apart from undefined and null, the other three have the corresponding constructor functions-Number(), String(), and Boolean(). Using these, you can create objects,...