Add basePropertyOf helper.

lodash.js

@@ -781,6 +781,32 @@
     return length ? (baseSum(array, iteratee) / length) : NAN;
   }
 
+  /**
+   * The base implementation of `_.property` without support for deep paths.
+   *
+   * @private
+   * @param {string} key The key of the property to get.
+   * @returns {Function} Returns the new accessor function.
+   */
+  function baseProperty(key) {
+    return function(object) {
+      return object == null ? undefined : object[key];
+    };
+  }
+
+  /**
+   * The base implementation of `_.propertyOf` without support for deep paths.
+   *
+   * @private
+   * @param {Object} object The object to query.
+   * @returns {Function} Returns the new accessor function.
+   */
+  function basePropertyOf(object) {
+    return function(key) {
+      return object == null ? undefined : object[key];
+    };
+  }
+
   /**
    * The base implementation of `_.reduce` and `_.reduceRight`, without support
    * for iteratee shorthands, which iterates over `collection` using `eachFunc`.
@@ -992,9 +1018,7 @@
    * @param {string} letter The matched letter to deburr.
    * @returns {string} Returns the deburred letter.
    */
-  function deburrLetter(letter) {
+  var deburrLetter = basePropertyOf(deburredLetters);
-    return deburredLetters[letter];
-  }
 
   /**
    * Used by `_.escape` to convert characters to HTML entities.
@@ -1003,9 +1027,7 @@
    * @param {string} chr The matched character to escape.
    * @returns {string} Returns the escaped character.
    */
-  function escapeHtmlChar(chr) {
+  var escapeHtmlChar = basePropertyOf(htmlEscapes);
-    return htmlEscapes[chr];
-  }
 
   /**
    * Used by `_.template` to escape characters for inclusion in compiled string literals.
@@ -1192,9 +1214,7 @@
    * @param {string} chr The matched character to unescape.
    * @returns {string} Returns the unescaped character.
    */
-  function unescapeHtmlChar(chr) {
+  var unescapeHtmlChar = basePropertyOf(htmlUnescapes);
-    return htmlUnescapes[chr];
-  }
 
   /*--------------------------------------------------------------------------*/
 
@@ -3370,19 +3390,6 @@
       return result;
     }
 
-    /**
-     * The base implementation of `_.property` without support for deep paths.
-     *
-     * @private
-     * @param {string} key The key of the property to get.
-     * @returns {Function} Returns the new accessor function.
-     */
-    function baseProperty(key) {
-      return function(object) {
-        return object == null ? undefined : object[key];
-      };
-    }
-
     /**
      * A specialized version of `baseProperty` which supports deep paths.
      *