Bump to v4.0.0.

attempt.js

@@ -0,0 +1,35 @@
+define(['./internal/apply', './isError', './rest'], function(apply, isError, rest) {
+
+  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
+  var undefined;
+
+  /**
+   * Attempts to invoke `func`, returning either the result or the caught error
+   * object. Any additional arguments are provided to `func` when it's invoked.
+   *
+   * @static
+   * @memberOf _
+   * @category Util
+   * @param {Function} func The function to attempt.
+   * @returns {*} Returns the `func` result or error object.
+   * @example
+   *
+   * // avoid throwing errors for invalid selectors
+   * var elements = _.attempt(function(selector) {
+   *   return document.querySelectorAll(selector);
+   * }, '>_>');
+   *
+   * if (_.isError(elements)) {
+   *   elements = [];
+   * }
+   */
+  var attempt = rest(function(func, args) {
+    try {
+      return apply(func, undefined, args);
+    } catch (e) {
+      return isError(e) ? e : new Error(e);
+    }
+  });
+
+  return attempt;
+});