Datatypes
Javascript is Dynamic TypingPrimitive and Object Type
Primitive Data Types:
1.Number - Represents both integer and floating-point numbers.
let age=10; #equal two apram enna num,str,bool ex...automatic convert pannikum enna datatype nu.
console.log(age);
console.log(typeof age);
output:
10
number
age="25";
console.log(age);
console.log(typeof age);
output:
string
float number:
let price=19.99;
console.log(price);
console.log(typeof price);
output:
19.999
number
2.String - Represents a sequence of characters.
let greeting="Hello World.!"
console.log(greeting);
console.log(typeof greeting);
output:
string
3.Boolean - Represents a logical entity and can have two values: true or false.
let isActive=true;
console.log( isActive);
console.log(typeof isActive);
let isActive=false;
console.log( isActive);
console.log(typeof isActive);
4.Undefined - A variable that has been declared but not assigned a value.
let name; #Error undefined
console.log( a);
console.log(typeof a);
5.Null - Represents the intentional absence of any object value.
let name = null:
console.log(name);
console.log(typeof name);
6.Symbol - Represents a unique and immutable value, often used as object property keys.
let unique=symbol("key"); #custom symbol
console.log(unique);
console.log(typeof unique);
output:
symbol("key")
7.BigInt - Represents whole numbers larger than 2^53 - 1 (the largest number JavaScript can reliably represent with the Number type).
let largeNumber=BigInt(68690356789000833);
let largeNumber=68690356789000833n; #using the n notation
console.log( largeNumber);
console.log(typeof largeNumber);
output:
68690356789000833n
Non-Primitive Data Types
1.Object
Represents a collection of properties, each consisting of a key (usually a string)
and a value (which can be any data type, including another object.
let person={
name-'ranjith'.
age=25,
isEmployed=true;
}
console.log( person); //total laa print agum
console.log( person .name); // name only
console.log( person .age); // age only
console.log( person .isEmployed);
console.log(typeof person);
2.Array
A special type of object used for storing ordered collections of values.
let number=[1,2,5,4,8];
console.log( number);
let mixdata=[1,'2',true,false,null,[1,2,'5',"str"] ,undefined ];
console.log( mixdata);
3.Function
A special type of object that is callable and can perform an action.
function invite( ){
console.log( "you are invitd");
}
invite()
4.Date - A built-in object for handling dates and times.
let now = new Date;
console.log( now);
outut:
date wed jul 24 2024 09.00:51 Gmt( indian stamdard)
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