Write a short note on javascript object.?
JavaScript is an Object Oriented Programming language (OOP). An Object is a special kind of data and acts like real –life objects. An object has properties and methods. A real-life example for object could be a music system. It has properties like, on, off, current volume, etc. The methods could be said as, turn on, turn off, increase volume, etc. Similarly, JavaScript objects do have properties and methods.
PROPERTIES:
Properties are the values associated with an Object.
Example: stringObject.lengthNOTE: ”. length” is a property which is associated with a string Object.
METHODS:
Methods could be said as the action which can be performed on an object.
Example: stringObject.link(url)NOTE: “.link()” is an action which is used to make a string Object into a link.
KINDS OF JAVASCRIPT OBJECTS
There are mainly 6 types of built-in Objects in Javascript. They are, string Object, date Object, Boolean Object, array Object, math Object and RegExp Objects.
JAVASCRIPT STRING OBJECT
A string Object is used to manipulate a stored piece of Text.
Examples:
String Object Properties: .length, .prototypeString Object Methods: big(), toUpperCase(), match();
Syntax for creating a String object:
var myStr=new String(string);
JavaScript Date Object
Date Object is used to work with dates and times.
Examples:
Date Object Properties: .constructor, .prototypeDate Object Methods: Date(), getDate(), getDay()
Syntax for creating a Date object:
var myDate=new Date();
JavaScript Array Object
Array Objects are used to store multiple values in a single variable. An Array can hold more than one value at a time.
Examples
Array Object Properties: .length, .prototype,Array Object Methods: .concant(), .join()
Syntax for creating an Array object:
var myColors=new Array("red”,”blue","green")
JavaScript Boolean Object
Boolean Object is used to convert a non-boolean value into a Boolean value. ( True /False).
Examples
Boolean Object Properties: .constructor, .prototypeBoolean Object Methods: .toString(),.valueOf()
Syntax for Creating a Boolean Object:
Var myBoolean = new Boolean(value);
JavaScript Math Object
Math Objects are used to perform mathematical tasks.
Examples
Math Object Properties: .SQRT1_2, .SQRT2Math Object methods: .round(x),.max(x,y)
Syntax for Creating a Math Object:
All properties and methods of Math can be called by using Math as an object without creating it, because math object is not a constructor.
JavaScript RegExp Object
The RegExp Obejct is used for “What” to search in the “text”. RegExp is the short for Regular Expression. We can use to search for a pattern inside a text. RegExp is used to strore a pattern.
Examples
RegExp Object Properties: .global, .ignoreCaseRegExp Object Methods: .test(), .exec(), .compile();
Syntax for creating a RegExp Object:
var txt=new RegExp(pattern,attributes);
OR
var txt=/pattern/attributes;
