// Function to find all unique quadruplets that add up to the target sum.

// FILL OUT YOUR SOLUTION HERE

function fourSum(nums, target) {

  // Write your logic here.

}

​

// Utility function to compare two 2D arrays

function are2DArraysEqual(arr1, arr2) {

  if (arr1.length !== arr2.length) return false;

​

  for (let i = 0; i < arr1.length; i++) {

    if (arr1[i].length !== arr2[i].length) return false;

​

    for (let j = 0; j < arr1[i].length; j++) {

      if (arr1[i][j] !== arr2[i][j]) return false;

    }

  }

​

  return true;

}

​

// Test cases to validate your solution

function runTests() {

  // Test Case 1

  let testCase1 = fourSum([1, 0, -1, 0, -2, 2], 0);

  let expected1 = [[-2, -1, 1, 2], [-2, 0, 0, 2], [-1, 0, 0, 1]];  // You can sort the arrays for easier comparison

  console.log("Test Case 1: ", are2DArraysEqual(testCase1, expected1) ? "Passed" : "Failed");