algorithms/lib/compress/compress.ts

// export function compress(chars: string[]) {
//   let L = 0;
//   let R = 1;
//   const N = chars.length;
//   let result = "";
//   let currentCounter = 1;

//   while (L <= N && R <= N) {
//     const curL = chars[L];
//     const curR = chars[R];


//     if (curL !== curR || curR === undefined) {
//       result += curL;
//       if (currentCounter > 1) {
//         result += currentCounter;
//         currentCounter = 1;
//       }
//       L = R;
//     }

//     if (curL === curR) {
//       currentCounter++;
//     }

//     R++
//   }

//   return result.length;
// };

export function compress(chars: string[]) {
  let L = 0;
  let R = 1;
  const N = chars.length;
  let currentCounter = 1;

  while (L <= N && R <= N) {
    const curL = chars[L];
    const curR = chars[R];


    if (curL !== curR || curR === undefined) {
      if (currentCounter > 1) {
        [...("" + currentCounter)].forEach((item, i) => {
          chars[L + 1 + i] = item;
        });
        currentCounter = 1;
      }
      L = R;
    }

    if (curL === curR) {
      currentCounter++;
      chars[R] = "";
    }

    R++
  }

  for (let [key, value] of Object.entries(chars)) {
    if (value === "") {
      chars.splice(+key, 1)
    }
  }

  console.log({ chars })

  return chars.filter(item => item).length;
};