Bump to v4.0.0.

internal/createCompounder.js

@@ -1,9 +1,9 @@
-var deburr = require('../string/deburr'),
-    words = require('../string/words');
+var arrayReduce = require('./arrayReduce'),
+    deburr = require('../deburr'),
+    words = require('../words');
 
 /**
- * Creates a function that produces compound words out of the words in a
- * given string.
+ * Creates a function like `_.camelCase`.
  *
  * @private
  * @param {Function} callback The function to combine each word.
@@ -11,15 +11,7 @@ var deburr = require('../string/deburr'),
  */
 function createCompounder(callback) {
   return function(string) {
-    var index = -1,
-        array = words(deburr(string)),
-        length = array.length,
-        result = '';
-
-    while (++index < length) {
-      result = callback(result, array[index], index);
-    }
-    return result;
+    return arrayReduce(words(deburr(string)), callback, '');
   };
 }