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6 Zigzag Conversion Leetcode Problem Javascript Solution

Zigzag conversion from leetcode in Javascript

Solution

const zigzag = (str, num) => {
  if (num === 1) {
    return str;
  }
  let check = true;
  let result = [];
  let i = 0;
  while (i < str.length) {
    result.push([]);
    let j = 0;
    while (j < num) {
      if (check){
        result[result.length-1].push(str[i]);
        i++;
      } else {
        if (j == 0) {
          result[result.length-1].push(null);
        } else if (j === num-1) {
          result[result.length-1].unshift(null);
        } else {
          result[result.length-1].unshift(str[i]);
          i++;
        }
      }
      j++;
    }
    check = !check;
  }
  let zigzag = [];
  for (let k = 0; k < num; k++){
    for(let l = 0; l < result.length; l++) {
      zigzag.push(result[l][k]);
    }
  }
  return zigzag.join("");
}

Example Input

zigzag("ABCD", 3)

Output

ABDC

Run

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