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
Group strings starting with similar number in JavaScript
Suppose, we have an array of Numbers represented by strings like this −
const arr = ["1.1","1.2","1.3","2.1","2.2","3.1","3.2","3.3","4.1","4.2"];
We are required to write a JavaScript function that takes in one such array and groups all the strings starting with same number in a common subarray.
Therefore, the output of our function should look like −
const output = [["1.1","1.2","1.3"],["2.1","2.2"],["3.1","3.2","3.3"],["4.1","4.2"]];
Example
The code for this will be −
const arr = ["1.1","1.2","1.3","2.1","2.2","3.1","3.2","3.3","4.1","4.2"];
const groupSimilarStarters = arr => {
let res = [];
res = arr.reduce((acc, val, ind) => {
const firstChar = el => {
return (el || '').split('.')[0];
}
if(firstChar(val) === firstChar(arr[ind - 1])){
acc[acc.length - 1].push(val);
}else{
acc.push([val]);
};
return acc;
}, []);
return res;
}
console.log(groupSimilarStarters(arr));Output
The output in the console −
[ [ '1.1', '1.2', '1.3' ], [ '2.1', '2.2' ], [ '3.1', '3.2', '3.3' ], [ '4.1', '4.2' ] ]
Updated on: 12-Oct-2020
213 Views
Advertisements