Bump to v3.0.0.

lang/isString.js

@@ -0,0 +1,36 @@
+import isObjectLike from '../internal/isObjectLike';
+
+/** `Object#toString` result references. */
+var stringTag = '[object String]';
+
+/** Used for native method references. */
+var objectProto = Object.prototype;
+
+/**
+ * Used to resolve the `toStringTag` of values.
+ * See the [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.prototype.tostring)
+ * for more details.
+ */
+var objToString = objectProto.toString;
+
+/**
+ * Checks if `value` is classified as a `String` primitive or object.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isString('abc');
+ * // => true
+ *
+ * _.isString(1);
+ * // => false
+ */
+function isString(value) {
+  return typeof value == 'string' || (isObjectLike(value) && objToString.call(value) == stringTag) || false;
+}
+
+export default isString;