(feature)Add in Number.IsInteger

README.md

@@ -141,6 +141,7 @@ then Lodash/Underscore is the better option.*
 1. [_.gte](#_gte)
 1. [_.isEmpty](#_isempty)
 1. [_.isFinite](#_isfinite)
+1. [_.isInteger](#_isInteger)
 1. [_.isNaN](#_isnan)
 1. [_.isNil](#_isnil)
 1. [_.isNull](#_isnull)
@@ -1719,6 +1720,31 @@ Converts value to a finite number.
 
 **[⬆ back to top](#quick-links)**
 
+### _.isInteger
+
+Checks if value is an integer.
+
+  ```js
+  // Lodash
+  console.log(_.isInteger(3))
+  // output: true
+  console.log(_.isInteger('3'))
+  // output: false
+
+  // Native
+  console.log(Number.isInteger(3))
+  // output: true
+  console.log(Number.isInteger('3'))
+  // output: false
+  ```
+#### Browser Support for `Number.isInteger()`
+
+![Chrome][chrome-image] | ![Edge][edge-image] | ![Firefox][firefox-image] | ![IE][ie-image] | ![Opera][opera-image] | ![Safari][safari-image]
+:-: | :-: | :-: | :-: | :-: | :-: |
+  ✔  |  12 ✔ | 16.0 ✔ |  ✖  |  ✔ |  ✔ |
+
+**[⬆ back to top](#quick-links)**
+
 ### _.isNaN
 
 Checks if a value is NaN.

lib/rules/rules.json

@@ -148,6 +148,12 @@
         "compatible": true,
         "alternative": "Number.isFinite()"
     },
+    "isInteger": {
+        "ruleName": "is-integer",
+        "compatible": true,
+        "alternative": "Number.isInteger()",
+        "ES6": true
+    },
     "isNaN": {
         "ruleName": "is-nan",
         "compatible": true,

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, 57, 'Don\'t miss a rule 😄');
+assert.equal(Object.keys(allRules).length, 58, 'Don\'t miss a rule 😄');
 
 const ruleTester = new RuleTester({
   parserOptions: { ecmaVersion: 2018, sourceType: "module" }

tests/unit/all.js

@@ -204,6 +204,32 @@ describe('code snippet example', () => {
       )
     })
   })
+  describe('isInteger', () => {
+    it('_.isInteger(3)', () => {
+       assert.equal(
+        _.isInteger(3),
+        Number.isInteger(3)
+      )
+    })
+    it('_.isInteger("3")', () => {
+       assert.equal(
+        _.isInteger("3"),
+        Number.isInteger("3")
+       )
+    })
+    it('_.isInteger(2.9)', () => {
+       assert.equal(
+        _.isInteger(2.9),
+        Number.isInteger(2.9)
+       )
+    })
+    it('_.isInteger(NaN)', () => {
+       assert.equal(
+        _.isInteger(NaN),
+        Number.isInteger(NaN)
+       )
+    })
+  })
   describe('get', () => {
     const get = (obj, path, defaultValue) => {
       const result = String.prototype.split.call(path, /[,[\].]+?/)