Bump to v4.0.0.

camelCase.js

@@ -0,0 +1,28 @@
+import capitalize from './capitalize';
+import createCompounder from './internal/createCompounder';
+
+/**
+ * Converts `string` to [camel case](https://en.wikipedia.org/wiki/CamelCase).
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to convert.
+ * @returns {string} Returns the camel cased string.
+ * @example
+ *
+ * _.camelCase('Foo Bar');
+ * // => 'fooBar'
+ *
+ * _.camelCase('--foo-bar');
+ * // => 'fooBar'
+ *
+ * _.camelCase('__foo_bar__');
+ * // => 'fooBar'
+ */
+var camelCase = createCompounder(function(result, word, index) {
+  word = word.toLowerCase();
+  return result + (index ? capitalize(word) : word);
+});
+
+export default camelCase;