add boolean, null, number, string, and undefined

README.md

@@ -135,6 +135,71 @@ console.log(functionThatReturnsArgument('foo'));
 // 'foo'
 ```
 
+## `empty.boolean` or `empty['boolean']`
+
+```js
+var booleanValue = empty.boolean; // or empty['boolean']
+
+// or
+
+var booleanValue = require('empty/boolean');
+
+console.log(booleanValue);
+// false
+```
+
+## `empty.null` or `empty['null']`
+
+```js
+var nullValue = empty.null; // or empty['null']
+
+// or
+
+var nullValue = require('empty/null');
+
+console.log(nullValue);
+// null
+```
+
+## `empty.number`
+
+```js
+var num = empty.number;
+
+// or
+
+var num = require('empty/number');
+
+console.log(num);
+// 0
+```
+
+## `empty.string`
+
+```js
+var str = empty.string;
+
+// or
+
+var str = require('empty/string');
+
+console.log(str);
+// ''
+```
+
+## `empty.undefined`
+
+```js
+var undef = empty.undefined;
+
+// or
+
+var undef = require('empty/undefined');
+
+console.log(undef);
+// undefined
+```
+
 # Credits
 
 Many thanks to [Arturo](https://github.com/acstll) for the name on [NPM](https://www.npmjs.com/package/empty). The original package repository can be found at [here](https://github.com/acstll/empty).

boolean.js

@@ -0,0 +1,3 @@
+'use strict';
+
+module.exports = false;

index.js

@@ -9,6 +9,11 @@ exports.functionThatReturnsFalse = require('./functionThatReturnsFalse');
 exports.functionThatReturnsNull = require('./functionThatReturnsNull');
 exports.functionThatReturnsThis = require('./functionThatReturnsThis');
 exports.functionThatReturnsArgument = require('./functionThatReturnsArgument');
+exports['boolean'] = require('./boolean');
+exports['null'] = require('./null');
+exports.number = require('./number');
+exports.string = require('./string');
+exports.undefined = require('./undefined');
 
 if ('production' != process.env.NODE_ENV) {
   Object.freeze(exports);

null.js

@@ -0,0 +1,3 @@
+'use strict';
+
+module.exports = null;

number.js

@@ -0,0 +1,3 @@
+'use strict';
+
+module.exports = 0;

package.json

@@ -1,6 +1,6 @@
 {
   "name": "empty",
-  "version": "0.10.1",
+  "version": "0.11.0",
   "description": "Utility that provides different types of empty objects.",
   "keywords": [
     "empty",

string.js

@@ -0,0 +1,3 @@
+'use strict';
+
+module.exports = '';

undefined.js

@@ -0,0 +1,3 @@
+'use strict';
+
+module.exports = void 0;