Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Finding union of two sets in JavaScript
Union Set
Union Set is the set made by combining the elements of two sets. Therefore, the union of sets A and B is the set of elements in A, or B, or both.
For example −
If we have two sets denoted by two arrays like this −
const arr1 = [1, 2, 3]; const arr2 = [100, 2, 1, 10];
Then the union set will be −
const union = [1, 2, 3, 10, 100];
We are required to write a JavaScript function that takes in two such arrays of literals and returns their union array.
Example
Following is the code −
const arr1 = [1, 2, 3];
const arr2 = [100, 2, 1, 10];
const findUnion = (arr1 = [], arr2 = []) => {
const map = {};
const res = [];
for (let i = arr1.length-1; i >= 0; -- i){
map[arr1[i]] = arr1[i];
};
for (let i = arr2.length-1; i >= 0; -- i){
map[arr2[i]] = arr2[i];
};
for (const n in map){
if (map.hasOwnProperty(n)){
res.push(map[n]);
}
}
return res;
};
console.log(findUnion(arr1, arr2));Output
Following is the output on console −
[ 1, 2, 3, 10, 100 ]
Updated on: 11-Dec-2020
895 Views
Advertisements