JavaScript: Split values of two given arrays into two groups
JavaScript fundamental (ES6 Syntax): Exercise-17 with Solution
Write a JavaScript program to split the values of two given arrays into two groups. If an element in the filter is true, the corresponding element in the collection belongs to the first group; otherwise, it belongs to the second group.
- Use Array.prototype.reduce() and Array.prototype.push() to add elements to groups, based on filter.
- If filter has a truthy value for any element, add it to the first group, otherwise add it to the second group.
Sample Solution:
JavaScript Code:
//#Source https://bit.ly/2neWfJ2
const bifurcate = (arr, filter) =>
arr.reduce((acc, val, i) => (acc[filter[i] ? 0 : 1].push(val), acc), [[], []]);
console.log(bifurcate([1, 2, 3, 4], [true, true, false, true]));
console.log(bifurcate([1, 2, 3, 4], [true, true, true, true]));
console.log(bifurcate([1, 2, 3, 4], [false, false, false, false]));
Sample Output:
[[1,2,4],[3]] [[1,2,3,4],[]] [[],[1,2,3,4]]
Flowchart:

Live Demo:
See the Pen javascript-basic-exercise-1-17 by w3resource (@w3resource) on CodePen.
Improve this sample solution and post your code through Disqus
Previous: Write a JavaScript function that returns true if the provided predicate function returns true for all elements in a collection, false otherwise.
Next: Write a JavaScript program to remove specified elements from the left of a given array of elements.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
- Weekly Trends
- Python Interview Questions and Answers: Comprehensive Guide
- Scala Exercises, Practice, Solution
- Kotlin Exercises practice with solution
- MongoDB Exercises, Practice, Solution
- SQL Exercises, Practice, Solution - JOINS
- Java Basic Programming Exercises
- SQL Subqueries
- Adventureworks Database Exercises
- C# Sharp Basic Exercises
- SQL COUNT() with distinct
- JavaScript String Exercises
- JavaScript HTML Form Validation
- Java Collection Exercises
- SQL COUNT() function
- SQL Inner Join