JavaScript: Get all possible subset with a fixed length combinations in an array

JavaScript Function: Exercise-21 with Solution

Fixed-Length Subsets

Write a JavaScript function to get all possible subsets with a fixed length (for example 2) combinations in an array.

Sample array : [1, 2, 3] and subset length is 2

Expected output : [[1,2],[1,3],[2,3]]

Sample Solution:

JavaScript Code:

// Function to get all possible subsets with a fixed length
function getSubsetsWithLength(arr, length) {
 const result = [];
 // Recursive function to generate subsets
 function generateSubsets(currentSubset, start) {
 if (currentSubset.length === length) {
 result.push([...currentSubset]); // Add a copy of the currentSubset to the result
 return;
 }
 for (let i = start; i < arr.length; i++) { currentSubset.push(arr[i]); generateSubsets(currentSubset, i + 1); currentSubset.pop(); } } generateSubsets([], 0); return result; } // Example usage: const inputArray = [1, 2, 3]; const subsetLength = 2; const resultSubsets = getSubsetsWithLength(inputArray, subsetLength); // Log the result to the console console.log(resultSubsets); 

Output:

[[1,2],[1,3],[2,3]]

Flowchart:

Live Demo:

See the Pen JavaScript - Get all possible subset with a fixed length combinations in an array-function-ex- 21 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that generates all subsets of an array with a fixed length using a recursive approach.
• Write a JavaScript function that returns all unique combinations of a specified length from an array.
• Write a JavaScript function that generates fixed-length subsets and sorts each subset before adding it to the final result.
• Write a JavaScript function that computes fixed-length subsets from an array without resorting to built-in combinatorics libraries.

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