Each function is used to iterate each and every element of an object. It is used to loop DOM elements, arrays and the object properties.
Following are the basic selectors in jQuery: Element ID CSS Name Tag Name DOM hierarchy
variables that are declared at method scope can have an implicit type var. An implicitly typed local variable is strongly typed just as if you had declared the type yourself, but the compiler determines the type.
Different principles of OOPS are Abstraction, Encapsulation, Polymorphism and Inheritance.