pascal_newton.js

// Print n lines of Pascal's triangle

// just a factorial function
function fa(num) {
  if (num === 0){ return 1; }
  else{ return num * fa( num - 1 ); }
}

// Binomial coefficient
function newt(n, k){
  return parseInt( 
      fa(n) / (fa(k) * fa(n-k) ) 
  );
}

// print a single line of Pascal's triangle
var make_line = function(n){
  // n = no. of the line to be returned
  var line = [];
  for(var i=0; i<=n; i++){
    line.push(newt(n, i));
  }
  return line;
};

// print n lines of Pascal's triangle
var pascal = function(n){
  for(var i=0; i<=n; i++){
    console.log( make_line(i) );
  } 
};

// for line no. 10
console.log(make_line(10));
// for 5 lines:
pascal(5);