Some more JavaScript

Some quick tips:

• To continue a string on the next line in JavaScript, use the \ operator like this:
  var s = "A long text \
  that continues on the next line";
  
  
• Create on the fly functions like this:
  function functionAssembler(operatorSign){
  return new Function("a","b","return a" + operatorSign + "b;");
  }
  Use it to create functions:
  var add = functionAssembler("+");
  var substract = functionAssembler("-");
  var multiply = functionAssembler("*");
  var divide = functionAssembler("/");
  Use the function as always:
  document.write(add(10,5));
  document.write(substract(12,6));
  document.write(multiply(5,3));
  document.write(divide(125,5));