Bump to v4.0.0.

trimStart.js

@@ -0,0 +1,42 @@
+import charsStartIndex from './internal/charsStartIndex';
+import stringToArray from './internal/stringToArray';
+import toString from './toString';
+
+/** Used to match leading and trailing whitespace. */
+var reTrimStart = /^\s+/;
+
+/**
+ * Removes leading whitespace or specified characters from `string`.
+ *
+ * @static
+ * @memberOf _
+ * @category String
+ * @param {string} [string=''] The string to trim.
+ * @param {string} [chars=whitespace] The characters to trim.
+ * @param- {Object} [guard] Enables use as an iteratee for functions like `_.map`.
+ * @returns {string} Returns the trimmed string.
+ * @example
+ *
+ * _.trimStart('  abc  ');
+ * // => 'abc  '
+ *
+ * _.trimStart('-_-abc-_-', '_-');
+ * // => 'abc-_-'
+ */
+function trimStart(string, chars, guard) {
+  string = toString(string);
+  if (!string) {
+    return string;
+  }
+  if (guard || chars === undefined) {
+    return string.replace(reTrimStart, '');
+  }
+  chars = (chars + '');
+  if (!chars) {
+    return string;
+  }
+  var strSymbols = stringToArray(string);
+  return strSymbols.slice(charsStartIndex(strSymbols, stringToArray(chars))).join('');
+}
+
+export default trimStart;