Add support for _.drop (#185)

* Add isNull and isUndefined.

* Fix rule count.

* Add lodash drop.

* Add documentation for drop.

* Fix broken merge.

README.md

@@ -85,6 +85,7 @@ For more information, see [Configuring the ESLint Plugin](configuring.md)
 1. [_.compact](#_compact)
 1. [_.concat](#_concat)
 1. [_.difference](#_difference)
+1. [_.drop](#_drop)
 1. [_.fill](#_fill)
 1. [_.find](#_find)
 1. [_.findIndex](#_findindex)
@@ -291,6 +292,34 @@ Similar to [without](#_without), but returns the values from array that are not
 
 **[⬆ back to top](#quick-links)**
 
+### _.drop
+
+Creates a slice of array with n elements dropped from the beginning.
+
+  ```js
+  // Underscore/Lodash
+  _.drop([1, 2, 3]);
+  // => [2, 3]
+
+  _.drop([1, 2, 3], 2);
+  // => [3]
+
+  // Native
+  [1, 2, 3].slice(1);
+  // => [2, 3]
+
+  [1, 2, 3].slice(2);
+  // => [3]
+  ```
+
+#### Browser Support for `Array.prototype.slice()`
+
+![Chrome][chrome-image] | ![Edge][edge-image] | ![Firefox][firefox-image] | ![IE][ie-image] | ![Opera][opera-image] | ![Safari][safari-image]
+:-: | :-: | :-: | :-: | :-: | :-: |
+  1.0 ✔  |  ✔  |  1.0 ✔  |  ✔  |  ✔  | ✔  |
+
+**[⬆ back to top](#quick-links)**
+
 ### _.fill
 
 Fills elements of array with value from start up to, but not including, end.

lib/rules/rules.json

@@ -3,6 +3,10 @@
         "compatible": true,
         "alternative": "Array.prototype.concat()"
     },
+    "drop": {
+        "compatible": true,
+        "alternative": "Array.prototype.slice()"
+    },
     "indexOf": {
         "compatible": true,
         "alternative": "Array.prototype.indexOf()"

tests/lib/rules/all.js

@@ -4,7 +4,7 @@ const assert = require('assert');
 const rules = require('../../../lib/rules/all');
 const allRules = require('../../../lib/rules/rules');
 
-assert.equal(Object.keys(allRules).length, 52, 'Don\'t miss a rule 😄');
+assert.equal(Object.keys(allRules).length, 53, 'Don\'t miss a rule 😄');
 
 const ruleTester = new RuleTester({
   parserOptions: { ecmaVersion: 2018, sourceType: "module" }