Datatypes
Javascript is Dynamic Typing
Primitive 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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