Use Array(n).join(ch) trick for strings of identical chars

AppKit/CPTextField.j

@@ -951,14 +951,7 @@ var secureStringForString = function(aString)
     // This is true for when aString === "" and null/undefined.
     if (!aString)
         return "";
-
-    var secureString = "",
-        length = aString.length;
-
-    while (length--)
-        secureString += CPSecureTextFieldCharacter;
-
-    return secureString;
+    return Array(aString.length).join(CPSecureTextFieldCharacter);
 }
 
 

Objective-J/utilities.js

@@ -168,10 +168,7 @@ var _sprintf_justify = function(sign, prefix, string, suffix, width, leftJustify
 
 var _sprintf_pad = function(n, ch)
 {
-    var result = "";
-    for (var i = 0; i < n; i++)
-        result += ch;
-    return result;
+    return Array(Math.max(0,n)).join(ch);
 }
 
 // Base64 encoding and decoding