Clean up string format solution with something a little more efficient. From #26.

Author: blakeembrey

string-format/README.md

@@ -1,10 +1,12 @@
-# String format
+# String Format
+
+Create a string formatting function that accepts an input string and a number of arguments to replace positions in the input string.
 
 ## Example
 
 ```
-format('Hello {0} {1}', 'Mr.', 'X') // => 'Hello Mr. X'
-format('{1}_{0}', '{1}', '{0}')     // => '{0}_{1}'
+f('Hello {0} {1}', 'Mr.', 'X') // => 'Hello Mr. X'
+f('{1}_{0}', '{1}', '{0}')     // => '{0}_{1}'
 ```
 
 By [Riga](https://github.com/riga).

string-format/string-format.js

@@ -1,12 +1,7 @@
-/*
- * A simple string formatting function
- * e.g.: format('Hello {0} {1}', 'Mr.', 'X') => 'Hello Mr. X'
- *       format('{1}_{0}', '{1}', '{0}')     => '{0}_{1}'
- */
+var stringFormat = function (string /* , args */) {
+    var args = Array.prototype.slice.call(arguments, 1);
 
-var format = function(s) {
-    var i = arguments.length;
-    while (i--)
-        s = s.replace(new RegExp('\\{' + (i-1) + '\\}', 'gm'), String(arguments[i]));
-    return s;
+    return string.replace(/\{(\d+)\}/g, function (_, arg) {
+      return arg in args ? args[arg] : _;
+    });
 };