Js | DataTypes |-JS Tutorial-php.cn

Js | DataTypes |

王林

Release： 2024-08-31 06:31:05

Original

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Js | DataTypes |

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

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age="25";
console.log(age);
console.log(typeof age); 

output:
string

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float number:

let price=19.99;
console.log(price);
console.log(typeof price); 

output:
19.999
number

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2.String - Represents a sequence of characters.

let greeting="Hello World.!"
console.log(greeting);
console.log(typeof greeting); 

output:
string

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3.Boolean - Represents a logical entity and can have two values: true or false.

let isActive=true;
console.log( isActive);
console.log(typeof  isActive);

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let isActive=false;
console.log( isActive);
console.log(typeof  isActive);

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4.Undefined - A variable that has been declared but not assigned a value.

let name;  #Error undefined
console.log( a);
console.log(typeof a);

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5.Null - Represents the intentional absence of any object value.

let name-null:
console.log(name);
console.log(typeof name);

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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")

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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);

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let largeNumber=68690356789000833n; #using the n notation

console.log( largeNumber);
console.log(typeof largeNumber); 

output:
68690356789000833n

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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);

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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);

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3.Function

A special type of object that is callable and can perform an action.

function invite( ){
   console.log( "you are invitd");
}
invite()

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**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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