JavaScript: interleave many arrays

interleave_many_arrays.js

// This function is quite flexible because it can handle any number of input arrays and
// doesn't require them to be of equal length. It interleaves as many elements as possible
// from each array, in the order that the arrays (and elements) were provided.

/**
 * Interleaves elements of multiple arrays.
 * The function takes any number of arrays as arguments. 
 */
function interleaveArrays(...args) {
  // Find the maximum length among all arrays
  const max = Math.max(...args.map(arr => arr.length));

  const result = [];

  for (let i = 0; i < max; i++) {
    for (let arr of args) {
      if (i < arr.length) {
        result.push(arr[i]);
      }
    }
  }

  return result;
}

const array1 = [1, 2, 3];
const array2 = ['A', 'B', 'C', 'D', 'E'];
const array3 = ['i', 'ii'];
const array4 = ['a', 'b', 'c'];

const result = interleaveArrays(array1, array2, array3, array4);
console.log(result);

// Output: [1, "A", "i", "a", 2, "B", "ii", "b", 3, "C", "c", "D", "E"]

// Try https://jsfiddle.net/vyspiansky/6wtxpb9g/