Bump to v3.0.0.

lang/isFunction.js

@@ -0,0 +1,51 @@
+import isNative from './isNative';
+import root from '../internal/root';
+
+/** `Object#toString` result references. */
+var funcTag = '[object Function]';
+
+/** 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;
+
+/** Native method references. */
+var Uint8Array = isNative(Uint8Array = root.Uint8Array) && Uint8Array;
+
+/**
+ * Checks if `value` is classified as a `Function` object.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isFunction(_);
+ * // => true
+ *
+ * _.isFunction(/abc/);
+ * // => false
+ */
+function isFunction(value) {
+  // Avoid a Chakra JIT bug in compatibility modes of IE 11.
+  // See https://github.com/jashkenas/underscore/issues/1621 for more details.
+  return typeof value == 'function' || false;
+}
+// Fallback for environments that return incorrect `typeof` operator results.
+if (isFunction(/x/) || (Uint8Array && !isFunction(Uint8Array))) {
+  isFunction = function(value) {
+    // The use of `Object#toString` avoids issues with the `typeof` operator
+    // in older versions of Chrome and Safari which return 'function' for regexes
+    // and Safari 8 equivalents which return 'object' for typed array constructors.
+    return objToString.call(value) == funcTag;
+  };
+}
+
+export default isFunction;