Pascal's Triangle/Pyramid

pascalsTriangle.js

function buildPascalTriangle(maxLevels, currentLevelNum = 0, previousLevel = []) {
  var currentLevel = [];
  currentLevel.push(1);
  previousLevel.forEach(function(item, idx) {
    var value = item + previousLevel[idx+1];
    currentLevel.push(value);
  });
  currentLevel[currentLevelNum] = 1;
  console.log(currentLevel);
  if(currentLevelNum < maxLevels) {
	currentLevelNum++;
	buildPascalTriangle(maxLevels, currentLevelNum, currentLevel);
  }
}
buildPascalTriangle(5);