Add jscs "disallowUnusedVariables" rule.

.jscsrc

@@ -84,6 +84,7 @@
     "disallowSpacesInsideArrayBrackets": true,
     "disallowSpacesInsideParentheses": true,
     "disallowTrailingWhitespace": true,
+    "disallowUnusedVariables": true,
 
     "jsDoc": {
         "checkRedundantAccess": true,

lib/main/build-dist.js

@@ -1,7 +1,6 @@
 'use strict';
 
-var _ = require('lodash'),
+var async = require('async'),
-    async = require('async'),
     path = require('path');
 
 var file = require('../common/file');

perf/perf.js

@@ -82,12 +82,6 @@
   /** Used to queue benchmark suites. */
   var suites = [];
 
-  /** Used to resolve a value's internal [[Class]]. */
-  var toString = Object.prototype.toString;
-
-  /** Detect if in a browser environment. */
-  var isBrowser = isHostType(root, 'document') && isHostType(root, 'navigator');
-
   /** Use a single "load" function. */
   var load = (typeof require == 'function' && !amd)
     ? require

test/test-fp.js

@@ -833,21 +833,17 @@
   QUnit.module('set methods');
 
   (function() {
-    var array = [1, 2, 3],
-        object = { 'a': 1 },
-        deepObject = { 'a': { 'b': 2, 'c': 3 } };
-
     QUnit.test('should only clone objects in `path`', function(assert) {
       assert.expect(11);
 
-      var object = { 'a': { 'b': { 'c': 1 }, 'd': { 'e': 1 } } },
+      var object = { 'a': { 'b': 2, 'c': 3 }, 'd': { 'e': 4 } },
           value = _.cloneDeep(object),
-          actual = fp.set('a.b.c.d.e', 3, value);
+          actual = fp.set('a.b.c.d', 5, value);
 
-      assert.ok(_.isObject(actual.a.b.c), 'fp.set');
+      assert.ok(_.isObject(actual.a.b), 'fp.set');
-      assert.ok(_.isNumber(actual.a.b.c), 'fp.set');
+      assert.ok(_.isNumber(actual.a.b), 'fp.set');
 
-      assert.strictEqual(actual.a.b.c.d.e, 3, 'fp.set');
+      assert.strictEqual(actual.a.b.c.d, 5, 'fp.set');
       assert.strictEqual(actual.d, value.d, 'fp.set');
 
       value = _.cloneDeep(object);
@@ -858,16 +854,16 @@
       value = _.cloneDeep(object);
       actual = fp.unset('a.b')(value);
 
-      assert.notOk('b' in actual, 'fp.unset');
+      assert.notOk('b' in actual.a, 'fp.unset');
-      assert.strictEqual(actual.d, value.d, 'fp.unset');
+      assert.strictEqual(actual.a.c, value.a.c, 'fp.unset');
 
-      value = _.cloneDeep(deepObject);
+      value = _.cloneDeep(object);
       actual = fp.update('a.b')(function(n) { return n * n; })(value);
 
       assert.strictEqual(actual.a.b, 4, 'fp.update');
       assert.strictEqual(actual.d, value.d, 'fp.update');
 
-      value = _.cloneDeep(deepObject);
+      value = _.cloneDeep(object);
       actual = fp.updateWith(Object)('[0][1]')(_.constant('a'))(value);
 
       assert.deepEqual(actual[0], { '1': 'a' }, 'fp.updateWith');
@@ -880,8 +876,7 @@
   QUnit.module('with methods');
 
   (function() {
-    var array = [1, 2, 3],
+    var object = { 'a': 1 };
-        object = { 'a': 1 };
 
     QUnit.test('should provide the correct `customizer` arguments', function(assert) {
       assert.expect(7);
@@ -1316,7 +1311,7 @@
       var args,
           object = { 'a': 1 };
 
-      var actual = fp.mapKeys(function() {
+      fp.mapKeys(function() {
         args || (args = slice.call(arguments));
       }, object);
 

test/test.js

@@ -33,7 +33,6 @@
 
   /** Used for native method references. */
   var arrayProto = Array.prototype,
-      errorProto = Error.prototype,
       funcProto = Function.prototype,
       objectProto = Object.prototype,
       numberProto = Number.prototype,
@@ -62,7 +61,6 @@
 
   var ArrayBuffer = root.ArrayBuffer,
       Buffer = root.Buffer,
-      DataView = root.DataView,
       Promise = root.Promise,
       Map = root.Map,
       Set = root.Set,
@@ -5643,8 +5641,7 @@
   lodashStable.each(['find', 'findLast', 'findIndex', 'findLastIndex', 'findKey', 'findLastKey'], function(methodName) {
     QUnit.module('lodash.' + methodName);
 
-    var func = _[methodName],
+    var func = _[methodName];
-        isFindKey = /Key$/.test(methodName);
 
     (function() {
       var objects = [
@@ -5888,7 +5885,6 @@
 
   lodashStable.each(['flatMap', 'flatMapDeep', 'flatMapDepth'], function(methodName) {
     var func = _[methodName],
-        isDeep = methodName == 'flatMapDeep',
         array = [1, 2, 3, 4];
 
     function duplicate(n) {
@@ -6510,7 +6506,6 @@
 
     lodashStable.each(lodashStable.difference(methods, unwrappedMethods), function(methodName) {
       var array = [1, 2, 3],
-          func = _[methodName],
           isBaseEach = methodName == '_baseEach';
 
       QUnit.test('`_.' + methodName + '` should return a wrapped value when implicitly chaining', function(assert) {
@@ -6527,8 +6522,7 @@
     });
 
     lodashStable.each(unwrappedMethods, function(methodName) {
-      var array = [1, 2, 3],
+      var array = [1, 2, 3];
-          func = _[methodName];
 
       QUnit.test('`_.' + methodName + '` should return an unwrapped value when implicitly chaining', function(assert) {
         assert.expect(1);
@@ -6559,8 +6553,7 @@
     });
 
     lodashStable.each(lodashStable.difference(methods, arrayMethods, forInMethods), function(methodName) {
-      var array = [1, 2, 3],
+      var func = _[methodName];
-          func = _[methodName];
 
       QUnit.test('`_.' + methodName + '` iterates over own string keyed properties of objects', function(assert) {
         assert.expect(1);
@@ -6631,8 +6624,7 @@
     });
 
     lodashStable.each(methods, function(methodName) {
-      var array = [1, 2, 3],
+      var func = _[methodName],
-          func = _[methodName],
           isFind = /^find/.test(methodName),
           isSome = methodName == 'some',
           isReduce = /^reduce/.test(methodName);
@@ -8254,7 +8246,7 @@
         var actual = _.invokeMap(array, 'toUpperCase');
       } catch (e) {}
 
-      assert.deepEqual(_.invokeMap(array, 'toUpperCase'), ['A', undefined, undefined, 'D']);
+      assert.deepEqual(actual, ['A', undefined, undefined, 'D']);
     });
 
     QUnit.test('should not error on elements with missing properties', function(assert) {
@@ -13316,8 +13308,7 @@
   QUnit.module('lodash.mapKeys and lodash.mapValues');
 
   lodashStable.each(['mapKeys', 'mapValues'], function(methodName) {
-    var array = [1, 2],
+    var func = _[methodName],
-        func = _[methodName],
         object = { 'a': 1, 'b': 2 };
 
     QUnit.test('`_.' + methodName + '` should iterate over own string keyed properties of objects', function(assert) {
@@ -14865,9 +14856,9 @@
       assert.expect(1);
 
       var source1 = { 'a': { 'b': { 'c': 1 } } },
-          source2 = { 'a': { 'b': { 'd': 2 } } },
+          source2 = { 'a': { 'b': { 'd': 2 } } };
-          actual = _.mergeWith({}, source1, source2, noop);
 
+      _.mergeWith({}, source1, source2, noop);
       assert.deepEqual(source1.a.b, { 'c': 1 });
     });
 
@@ -15233,8 +15224,7 @@
   QUnit.module('extremum methods');
 
   lodashStable.each(['max', 'maxBy', 'min', 'minBy'], function(methodName) {
-    var array = [1, 2, 3],
+    var func = _[methodName],
-        func = _[methodName],
         isMax = /^max/.test(methodName);
 
     QUnit.test('`_.' + methodName + '` should work with Date objects', function(assert) {
@@ -24223,8 +24213,7 @@
 
   lodashStable.each(['update', 'updateWith'], function(methodName) {
     var func = _[methodName],
-        oldValue = 1,
+        oldValue = 1;
-        value = 2;
 
     QUnit.test('`_.' + methodName + '` should invoke `updater` with the value on `path` of `object`', function(assert) {
       assert.expect(4);
@@ -24610,7 +24599,6 @@
 
   lodashStable.each(['zipObject', 'zipObjectDeep'], function(methodName) {
     var func = _[methodName],
-        array = [['barney', 36], ['fred', 40]],
         object = { 'barney': 36, 'fred': 40 },
         isDeep = methodName == 'zipObjectDeep';