Rename mapKeys and mapValues to mapKey and mapValue.

mapValue.js

@@ -0,0 +1,33 @@
+import baseAssignValue from './.internal/baseAssignValue.js'
+
+/**
+ * Creates an object with the same keys as `object` and values generated
+ * by running each own enumerable string keyed property of `object` thru
+ * `iteratee`. The iteratee is invoked with three arguments:
+ * (value, key, object).
+ *
+ * @since 2.4.0
+ * @category Object
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Object} Returns the new mapped object.
+ * @see mapKeys
+ * @example
+ *
+ * const users = {
+ *   'fred':    { 'user': 'fred',    'age': 40 },
+ *   'pebbles': { 'user': 'pebbles', 'age': 1 }
+ * }
+ *
+ * mapValue(users, ({ age }) => age)
+ * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
+ */
+function mapValue(object, iteratee) {
+  const result = {}
+  Object.keys(object).forEach((value, key, object) => {
+    baseAssignValue(result, key, iteratee(value, key, object))
+  })
+  return result
+}
+
+export default mapValues