PascalTriangle LeetCode Solution

PascalTriangle.js

/**
 * @param {number} numRows
 * @return {number[][]}
 */

var generate = function(numRows) {
  var result = [];

  for (var i = 0; i < numRows; i++) {
    var row = [];
    if (i === 0) {
      row.push(1);
      result.push(row);
    } else {
      var j = 0;
      while(j <= i) {
        if (j === 0) {
          row.push(1);
        } else if (j === i) {
          row.push(1);
          result.push(row);
        } else {
          var value = result[i - 1][j - 1] + result[i - 1][j];
          row.push(value);
        }
        j++;
      }
    }
  }  

  return result;
};