Bump to v4.0.0.

isNative.js

@@ -0,0 +1,52 @@
+define(['./isFunction', './internal/isHostObject', './isObjectLike'], function(isFunction, isHostObject, isObjectLike) {
+
+  /** Used to match `RegExp` [syntax characters](http://ecma-international.org/ecma-262/6.0/#sec-patterns). */
+  var reRegExpChar = /[\\^$.*+?()[\]{}|]/g;
+
+  /** Used to detect host constructors (Safari > 5). */
+  var reIsHostCtor = /^\[object .+?Constructor\]$/;
+
+  /** Used for built-in method references. */
+  var objectProto = Object.prototype;
+
+  /** Used to resolve the decompiled source of functions. */
+  var funcToString = Function.prototype.toString;
+
+  /** Used to check objects for own properties. */
+  var hasOwnProperty = objectProto.hasOwnProperty;
+
+  /** Used to detect if a method is native. */
+  var reIsNative = RegExp('^' +
+    funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&')
+    .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
+  );
+
+  /**
+   * Checks if `value` is a native function.
+   *
+   * @static
+   * @memberOf _
+   * @category Lang
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `value` is a native function, else `false`.
+   * @example
+   *
+   * _.isNative(Array.prototype.push);
+   * // => true
+   *
+   * _.isNative(_);
+   * // => false
+   */
+  function isNative(value) {
+    if (value == null) {
+      return false;
+    }
+    if (isFunction(value)) {
+      return reIsNative.test(funcToString.call(value));
+    }
+    return isObjectLike(value) &&
+      (isHostObject(value) ? reIsNative : reIsHostCtor).test(value);
+  }
+
+  return isNative;
+});