reading-notes

Domain Modeling

he domain model is a representation of meaningful real-world concepts pertinent to the domain that need to be modeled in software.

var EpicFailVideo = function(epicRating, hasAnimals) {
  this.epicRating = epicRating;
  this.hasAnimals = hasAnimals;
}

var parkourFail = new EpicFailVideo(7, false);
var corgiFail = new EpicFailVideo(4, true);

console.log(parkourFail);
console.log(corgiFail);

Generate random numbers

random number between 0 and 1, use the Math. random() function. If you want a random number between 1 and 10, multiply the results of Math. random by 10, then round up or down

EpicFailVideo.prototype.generateRandom = function(min, max) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

Chapter 6: “Tables” (pp.126-145)

A table is a data structure that organizes information into rows and columns.

Basic Table Structure

<table>
<tr>
<td>15</td>
<td>15</td>
<td>30</td>
</tr>

Table Headings

The <th> element is used just like the <td> element but its purpose is to represent the heading for either a column or a row.

Sometimes you may need the entries in a table to stretch across more than one column and one row.

for that we use :

1. Spanning Columns , for columns

1. Spanning row , for row

Chapter 3: “Functions, Methods, and Objects” (pp.106-144)

The way to create an “object type”, is to use an object constructor function.

CREATING OBJECTS USING CONSTRUCTOR SYNTAX

var hotel = new Object();
hotel.name= 'Park';
hotel.rooms = 120;
hotel .booked = 77;
hotel .checkAvailability = function()
return this . rooms - this.booked;
} ;

ADDING AND REMOVING PROPERTIES

do this using the dot notation.

hotel .gym = t rue;
hotel .pool = fal se;
delete hotel .booked;

RECAP: STORING DATA

In JavaScript, data is represented using name/value pairs. In arrays and objects the name is also known as a key.

1. VARIABLES

A variable has just one key.

var hotel= 'Quay' ;

1. ARRAYS

Arrays can store multiple pieces of information.

var hotel s = [
'Quay ' ,
' Park' ,
' Beach' ,
'Bloomsbury'
]