Use a Set and ES2015ify (#2)

* Use a `Set` and ES2015ify

Fixes #1.

* Inline return

* Meta tweaks

* Add XO

.editorconfig

@@ -7,9 +7,6 @@ charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
 
-[package.json]
+[{package.json,*.yml}]
 indent_style = space
 indent_size = 2
-
-[*.md]
-trim_trailing_whitespace = false

.travis.yml

@@ -1,6 +1,5 @@
 sudo: false
 language: node_js
 node_js:
-  - 'iojs'
-  - '0.12'
-  - '0.10'
+  - '6'
+  - '4'

index.js

@@ -1,12 +1,7 @@
 'use strict';
-var path = require('path');
-var binaryExtensions = require('binary-extensions');
-var exts = Object.create(null);
+const path = require('path');
+const binaryExtensions = require('binary-extensions');
 
-binaryExtensions.forEach(function (el) {
-	exts[el] = true;
-});
+const exts = new Set(binaryExtensions);
 
-module.exports = function (filepath) {
-	return path.extname(filepath).slice(1).toLowerCase() in exts;
-};
+module.exports = filepath => exts.has(path.extname(filepath).slice(1).toLowerCase());

package.json

@@ -10,10 +10,10 @@
     "url": "sindresorhus.com"
   },
   "engines": {
-    "node": ">=0.10.0"
+    "node": ">=4"
   },
   "scripts": {
-    "test": "ava"
+    "test": "xo && ava"
   },
   "files": [
     "index.js"
@@ -34,6 +34,10 @@
     "binary-extensions": "^1.0.0"
   },
   "devDependencies": {
-    "ava": "*"
+    "ava": "*",
+    "xo": "*"
+  },
+  "xo": {
+    "esnext": true
   }
 }

readme.md

@@ -13,7 +13,7 @@ $ npm install --save is-binary-path
 ## Usage
 
 ```js
-var isBinaryPath = require('is-binary-path');
+const isBinaryPath = require('is-binary-path');
 
 isBinaryPath('src/unicorn.png');
 //=> true
@@ -25,10 +25,10 @@ isBinaryPath('src/unicorn.txt');
 
 ## Related
 
-- [`binary-extensions`](https://github.com/sindresorhus/binary-extensions) - List of binary file extensions
-- [`is-text-path`](https://github.com/sindresorhus/is-text-path) - Check if a filepath is a text file
+- [binary-extensions](https://github.com/sindresorhus/binary-extensions) - List of binary file extensions
+- [is-text-path](https://github.com/sindresorhus/is-text-path) - Check if a filepath is a text file
 
 
 ## License
 
-MIT © [Sindre Sorhus](http://sindresorhus.com)
+MIT © [Sindre Sorhus](https://sindresorhus.com)