
- Trending Categories
Data Structure
Networking
RDBMS
Operating System
Java
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Sum all duplicate value in array - JavaScript
We are required to write a JavaScript function that takes in an array of numbers with duplicate entries and sums all the duplicate entries to one index
For example −
If the input array is −
const input = [1, 3, 1, 3, 5, 7, 5, 4];
Then the output should be −
const output = [2, 6, 7, 10, 4];
Example
Let’s write the code −
const input = [1, 3, 1, 3, 5, 7, 5, 3, 4]; const sumDuplicate = arr => { const map = arr.reduce((acc, val) => { if(acc.has(val)){ acc.set(val, acc.get(val) + 1); }else{ return acc; }, new Map()); } return Array.from(map, el => el[0] * el[1]); }; console.log(sumDuplicate(input));
Output
Following is the output in the console −
[ 2, 9, 10, 7, 4 ]
- Related Questions & Answers
- Sum all duplicate values in array in JavaScript
- Sum all similar elements in one array - JavaScript
- Reverse index value sum of array in JavaScript
- Remove the duplicate value from array with images data in JavaScript
- Sum of all prime numbers in an array - JavaScript
- Finding all duplicate numbers in an array with multiple duplicates in JavaScript
- Sum of all positives present in an array in JavaScript
- Find all pairs that sum to a target value in JavaScript
- How to sum all elements in a nested array? JavaScript
- Removing duplicate objects from array in JavaScript
- JavaScript recursive loop to sum all integers from nested array?
- Sum of all multiples in JavaScript
- List all duplicate values in a nested JavaScript object
- Sum arrays repeated value - JavaScript
- Sum JavaScript arrays repeated value
Advertisements