crappy pascal's triangle

// crap
const printPT = height => {
  const getPT = () => {
    let PT = [
      ' 1 ',
      '1 1'
    ];

    if (height <= 2) return PT;

    for (let i = 0; i < height - 2; i++) {
      let width = PT[PT.length - 1].length + 2;
      let row = '1';
      for (let j = 1; j < width; j++) {
        if (j % 2 === 0) {
          row += '1';
        } else {
          row += ' ';
        }
      }
      PT.push(row);
    }

    PT.forEach((row, i) => {
      if (i === PT.length - 1) return;
      const targetLength = PT[PT.length - 1].length;
      const length = row.length;
      const diff = targetLength - length;
      let add = '';
      for (let j = 1; j <= diff/2; j++) {
        add += ' ';
      }
      PT[i] = add.concat(row);
    });

    PT.forEach((row, i) => {
      if (i < 2) return;

      const prevRow = PT[i - 1];
      [...row].forEach((char, j) => {
        if (char === ' ' || j === 0 || j === row.length - 1) return;
        const hasTopX = parseInt(prevRow[j - 1]);
        const hasTopY = parseInt(prevRow[j + 1]);
        if (Number.isInteger(hasTopX) && Number.isInteger(hasTopY)) {
          const sum = hasTopX + hasTopY;
          PT[i] = [...PT[i]]
          PT[i][j] = sum;
        }
      })
    });

    return PT;
  }

  getPT().forEach(row => console.log([...row].join('')));
}

printPT(10)