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CLASS-07

DOMAIN MODELING

Domain modeling is the process of creating a conceptual model in code for a specific problem. A model describes the several entities, values, their attributes and behaviors. A well articulated domain model can verify and validate our your understanding of the problem.

  • Object oriented model: Refers to an entity that stores data properties and encapsulates behaviors on methods.

Tips when building domain models

  1. When modeling a single entity that’ll have many instances, build self-contained objects with the same attributes and behaviors.
  2. Model its attributes with a constructor function that defines and initializes properties.
  3. Model its behaviors with small methods that focus on doing one job well.
  4. Create instances using the new keyword followed by a call to a constructor function.
  5. Store the newly created object in a variable so you can access its properties and methods from outside.
  6. Use the this variable within methods so you can access the properties of objects and methods from inside.

HTML TABLES

Tables are various types of information that need to be displayed in a grid format. Like a spreadsheet.

KEY ELEMENTS FOR CREATING TABLES

  • <table> Adds tables to the page.
  • <tr> Creates each row on the table.
  • <td> Creates the cell inside a row.
  • <th> Creates a heading cell inside a row.

We cab also use <thead>, <tbody> and <tfoot> to create long tables.

JAVASCRIPT

OBJECT CONSTRUCTOR NOTATION

We use a combination of new keyword and the Object() constructors function (e.g)

let hotel = new Object();

To update the value of properties we use dot notation. (e.g)

hotel.name = 'Park';

KEYWORD THIS

It is commonly used inside functions and objects. Where the functions is declared alters what it means. It refers to one object, usually the one where in which the functions operates.

  • Functions in global scope: When they are created at the top level of the script. Not inside an object. It’s also called global context.
  • Global variables: Can also become properties of the window object. When a function is the global context you can access global variables.

STORING DATA

Data is represented using name/value pairs. We use Arrays or Objects to group a set of related values.

  • Variables: Have just one key and one value. (e.g)

let hotel = 'Park'

  • Arrays: Can store multiple pieces of information (e.g)

Let hotels = ['Quay' 'Park' 'Beach']

Things I want to know more about

  • Objects Literal and Constructor.

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