OOP is a programming paradigm which provides an easily comprehensible method for modeling complicated systems of real world data into manageable software solutions. paradigm - A pattern or model.

Create, read, update, delete.

Attributes are additional information about HTML elements, which are specified within the elements start tag. eg src alt href class id usually come in name=”value” pairs.

A higher order function is a function which accepts functions as parameters, and/or returns a function. Higher order functions help reduce code duplication and favor the single responsibility principle. A first order function only accepts/returns primitives or objects.

When using extends to extend the functionality of a class, if we exclude the constructor the derived class will invoke the constructor of its parent class. If we intend to add unique properties to the derived class, we can achieve this by creating its own constructor and invoking super() to inherit the properties of the parent class.

When a property and key are the same, we can shorten the object by only including the key.

Both are looping constructs. ‘for in’ iterates over all enumerable property keys of an object. ‘for of’ iterates over the values of an iterable object. What are reference types? Reference types include arrays, objects and functions.

A set is an object with a collection of values, within which a value may occur only once. That is to say that each value is unique within the set. A set is similar to an array, but they are not indexed.