Update urlify.js

chapter01/1.3 - URLify/urlify.js

@@ -1,23 +1,8 @@
 var urlify = function(str, length) {
-  // have a pointer to check from start to end
-  var strArr = str.split('');
-  var pointer = 0;
-  while (pointer < str.length) {
-    if (strArr[pointer] === ' ') {
-      // *** needs more work here, a little wierd
-      // not handling trailing spaces properly
-      for (var i = str.length - 1; i > pointer + 3; i--) {
-        strArr[i] = str[i - 2];
-      }
-      strArr[pointer] = '%';
-      strArr[pointer+1] = '2';
-      strArr[pointer+2] = '0';
-      console.log(strArr, strArr.length);
-    } 
-    pointer++;
+  var strArr = [];
+  for(var i = 0; i < length; i++) {
+     strArr[i] = str[i] == ' ' ? '%20' : str[i]; 
   }
-  // if character is a space, move remainder chars by two
-  // replace following three chars with '%20'
   return strArr.join('');
 };