crate combination from the any number lists in javascript

index.tsx
function getAllCombinations(arrays) {
  let result = [];
  
  function backtrack(combination, start) {
    if (combination.length === arrays.length) {
      result.push(combination);
      return;
    }
    
    for (let i = start; i < arrays[combination.length].length; i++) {
      backtrack([...combination, arrays[combination.length][i]], i + 1);
    }
  }
  
  backtrack([], 0);
  return result;
}

// Usage
let arrays = [
  [1, 2],
  [3, 4],
  [5, 6]
];
console.log(getAllCombinations(arrays)); // Output: [[1,3,5],[1,3,6],[1,4,5],[1,4,6],[2,3,5],[2,3,6],[2,4,5],[2,4,6]]
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