119. Pascal's Triangle II.js

/**
 * @param {number} rowIndex
 * @return {number[]}
 */
var getRow = function (rowIndex) {
  const answer = [];
  for (let i = 0; i < rowIndex + 1; i++) {
    if (i === 0) {
      answer.push([1]);
      continue;
    }

    const tmp = [1];

    for (let j = 0; j < i - 1; j++) {
      tmp.push(answer[i - 1][j] + answer[i - 1][j + 1]);
    }

    tmp.push(1);
    answer.push([...tmp]);
  }

  return answer[rowIndex];
};