A Javascript Program to find the count of unique string {a: 13, b: 12, c:13}

A Javascript Program to find the count of unique string -

Example:

var str = 'aaabbcccabcbcacbaabcbcabbccaaaabcbc';

Program: 

Part A:  Program to find the unique character in the given String -

var uniqLetter = [];

str.split('').map((item) =>{

    if(!uniqLetter.includes(item)){

        uniqLetter.push(item);

    }

});

Part B:  Now iterate on unique String & find the total count of the characetr in the given String & form the object -

var temp = {};

uniqLetter.map((i) => {

         temp = {...temp,

           ...{[i]: str.split(i).length}

           };

});

console.log(temp);

Java SpringBoot Configuration Examples -

 Java SpringBoot Configuration Example -

File - application.properties

server.port=1010

+------------------------------------------------------------------------+

logging.level.org.springframework.web: DEBUG

logging.level.org.hibernate: ERROR

+------------------------------------------------------------------------+

spring.application.name=login-service

spring.datasource.url=jdbc:mysql://localhost:3306/microservices

spring.datasource.username=root

spring.datasource.password=root@12345

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

spring.jpa.database-platform = org.hibernate.dialect.MySQLDialect

spring.jpa.generate-ddl=true

spring.jpa.hibernate.ddl-auto = update

spring.jpa.properties.hibernate.globally_quoted_identifiers=true

+------------------------------------------------------------------------+

spring.security.user.name=admin

spring.security.user.password=admin

spring.security.user.roles=manager

Difference between Javascript Map & Filter Method -

Difference between Javascript Map & Filter Method  -

Program I: 

var arr = [4, 24, 65, 13, 98];

var newArray = arr.map((i) => i + 20);

console.log(newArray);

Output:

(5) [24, 44, 85, 33, 118]

Program II: 

var arr = [4, 24, 65, 13, 98];

var newFilter = arr.filter((i) => i + 20);

console.log(newFilter );

Output:

(5) [4, 24, 65, 13, 98]

Finally, Ouput indicates that the main difference in using the map & filter is that filter doesn't change the value of array element while map can have the updated values for the elements. 

Map & Filter both method return the new array.

Map methos keeps all the indexes in the new Array while Filter keep only the true case index in new array.