Solution.js

/**
 * @param {number} rowIndex
 * @return {number[]}
 */
var getRow = function(rowIndex) {
  var rowArr = function(numRows) {
      let arr = []
      for(var i = 1; i <= numRows; i++) {
          if(i === 1) {
            arr.push([1])
            continue
          }
          if(i === 2) {
            arr.push([1, 1])
            continue
          }
          let innerArr = [1]
          for(var j = 2; j < i; j++) {
            innerArr.push(arr[i-2][j-2] + arr[i-2][j-1])
          }
          innerArr.push(1)
          arr.push(innerArr)
        }
        return arr
  }
  return rowArr(rowIndex + 1)[rowIndex]
};