init

.editorconfig

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+root = true
+
+[*]
+indent_style = tab
+indent_size = 4
+charset = utf-8
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false
+
+[{*.{coffee,cson,yml,yaml,jade,pug},package.json,bower.json}]
+indent_style = space
+indent_size = 2

.eslintrc.json

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+{
+	"parserOptions": {
+		"ecmaVersion": 6
+	},
+	"rules": {
+		"indent": [
+			"warn",
+			"tab",
+			{
+				"SwitchCase": 1
+			}
+		],
+		"linebreak-style": "off",
+		"semi": [
+			"error",
+			"always"
+		],
+		"no-unused-vars": "warn",
+		"no-console": "off",
+		"no-redeclare": "warn",
+		"space-before-function-paren": "off",
+		"space-infix-ops": [
+			"error",
+			{
+				"int32Hint": false
+			}
+		]
+	},
+	"env": {
+		"node": true,
+		"es6": true,
+		"mocha": true
+	},
+	"extends": "eslint:recommended"
+}

.gitignore

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+
+# Created by https://www.gitignore.io/api/node,windows
+
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules
+jspm_packages
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+
+
+### Windows ###
+# Windows image file caches
+Thumbs.db
+ehthumbs.db
+
+# Folder config file
+Desktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+

README.md

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+# NVL
+[![license](https://img.shields.io/github/license/gluons/NVL.svg?style=flat-square)](https://github.com/gluons/NVL/blob/master/LICENSE)
+[![npm](https://img.shields.io/npm/v/nvl.svg?style=flat-square)](https://www.npmjs.com/package/nvl)
+[![npm](https://img.shields.io/npm/dt/nvl.svg?style=flat-square)](https://www.npmjs.com/package/nvl)
+[![Travis](https://img.shields.io/travis/gluons/NVL.svg?style=flat-square)](https://travis-ci.org/gluons/NVL)
+
+🚮 Replace a blank value with your value.
+
+## Installation
+```
+npm install nvl
+```
+
+## Usage
+```javascript
+const nvl = require('nvl');
+
+let notYet = void 0; // undefined
+let nil = null;
+
+nvl(notYet, true); // -> true
+nvl(nil, 1); // -> 1
+nvl([], [1]); // -> []
+nvl({}, { a: 1, b: 2}); // -> {}
+nvl(false, true); // -> false
+```

index.js

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+'use strict';
+
+module.exports = function nvl(value, replaceWith) {
+	return (typeof value !== 'undefined') && (value != null) ? value : replaceWith;
+};

package.json

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+{
+  "name": "nvl",
+  "version": "1.0.0",
+  "description": "Replace a blank value with your value.",
+  "main": "index.js",
+  "scripts": {
+    "test": "mocha"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/gluons/NVL.git"
+  },
+  "keywords": [
+    "nvl",
+    "null",
+    "undefined"
+  ],
+  "author": "Saran Tanpituckpong <sarunta@gmail.com>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/gluons/NVL/issues"
+  },
+  "homepage": "https://github.com/gluons/NVL",
+  "devDependencies": {
+    "mocha": "*"
+  }
+}

test/tests.js

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+'use strict';
+
+const assert = require('assert');
+const nvl = require('../');
+
+describe('NVL', () => {
+	it('shoud return `value` when `value` is not blank value', () => {
+		let now = new Date();
+		let emptyArr = [];
+		let emptyObj = {};
+		assert.strictEqual(nvl(now, new Date(0)), now);
+		assert.strictEqual(nvl(emptyArr, [1]), emptyArr);
+		assert.strictEqual(nvl(emptyObj, { a: 1, b: 2}), emptyObj);
+		assert.strictEqual(nvl(false, true), false);
+	});
+	it('shoud return `replaceWith` when `value` is undefined.', () => {
+		let notYet = void 0;
+		let now = new Date();
+		assert.strictEqual(nvl(notYet, now), now);
+	});
+	it('shoud return `replaceWith` when `value` is null.', () => {
+		let nil = null;
+		let now = new Date();
+		assert.strictEqual(nvl(nil, now), now);
+	});
+});