Merge branch 'grep'

Author: dgraham

README.md

@@ -45,6 +45,7 @@ Add `jquery` to the plugins section of your `.eslintrc` configuration file. You
     "jquery/no-filter": 2,
     "jquery/no-find": 2,
     "jquery/no-global-eval": 2,
+    "jquery/no-grep": 2,
     "jquery/no-has": 2,
     "jquery/no-hide": 2,
     "jquery/no-html": 2,

index.js

@@ -19,6 +19,7 @@ module.exports = {
     'no-filter': require('./rules/no-filter'),
     'no-find': require('./rules/no-find'),
     'no-global-eval': require('./rules/no-global-eval'),
+    'no-grep': require('./rules/no-grep'),
     'no-has': require('./rules/no-has'),
     'no-hide': require('./rules/no-hide'),
     'no-html': require('./rules/no-html'),
@@ -68,6 +69,7 @@ module.exports = {
         'jquery/no-filter': 2,
         'jquery/no-find': 2,
         'jquery/no-global-eval': 2,
+        'jquery/no-grep': 2,
         'jquery/no-has': 2,
         'jquery/no-hide': 2,
         'jquery/no-html': 2,

rules/no-grep.js

@@ -0,0 +1,18 @@
+'use strict'
+
+module.exports = function(context) {
+  return {
+    CallExpression: function(node) {
+      if (node.callee.type !== 'MemberExpression') return
+      if (node.callee.object.name !== '$') return
+      if (node.callee.property.name !== 'grep') return
+
+      context.report({
+        node: node,
+        message: 'Prefer Array#filter to $.grep'
+      })
+    }
+  }
+}
+
+module.exports.schema = []

tests/no-grep.js

@@ -0,0 +1,17 @@
+'use strict'
+
+const rule = require('../rules/no-grep')
+const RuleTester = require('eslint').RuleTester
+
+const error = 'Prefer Array#filter to $.grep'
+
+const ruleTester = new RuleTester()
+ruleTester.run('no-in-array', rule, {
+  valid: ['grep()', '"test".grep()', '"test".grep'],
+  invalid: [
+    {
+      code: '$.grep()',
+      errors: [{message: error, type: 'CallExpression'}]
+    }
+  ]
+})