diamond.js

function makeDiamond(){
  var s = document.getElementById("diamondLetter").value;
  var sCode = s.charCodeAt(0);

  var output = [];
  output.push("A</br>");

  var numRows = sCode - 65;
  var nextCharCode = 66;
  var i;
  for (i = 0; i < numRows; i++) {
      var thisChar = nextCharCode + i;
      output.push(String.fromCharCode(thisChar) + spacesByCode(thisChar) + String.fromCharCode(thisChar) + "<br/>");
  }

  // output now has A through requested. Now flip it.
  for (i = output.length - 2; i >= 0; i--) {
    output.push(output[i]);
  }

  // if there's only row, put another A in there so is A-A not just A
  if (output.length == 1) {
    output.push("A</br>");
  }
  document.getElementById("result").innerHTML = output.join("");
}

function spacesByCode(code) {
  var spaces = "";
  var numSpaces = code - 64;
  var j;
  for (j = 1; j < numSpaces; j++) {
    spaces += "&nbsp";
  }
  return spaces;
}