Bump to v4.0.0.

trimStart.js

@@ -0,0 +1,44 @@
+define(['./internal/charsStartIndex', './internal/stringToArray', './toString'], function(charsStartIndex, stringToArray, toString) {
+
+  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
+  var undefined;
+
+  /** 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('');
+  }
+
+  return trimStart;
+});