Add Eslint and Prettier with precommit task

.editorconfig

@@ -0,0 +1,14 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = tab
+insert_final_newline = true
+max_line_length = 130
+trim_trailing_whitespace = true
+
+[*.md]
+max_line_length = 130
+trim_trailing_whitespace = true

.eslintrc.json

@@ -0,0 +1,27 @@
+{
+    "env": {
+      "browser": true,
+      "commonjs": true,
+      "es2021": true
+    },
+    "extends": [
+      "eslint:recommended",
+      "airbnb-base"
+    ],
+    "parserOptions": {
+      "ecmaVersion": 12
+    },
+    "rules": {
+      "indent": ["error", "tab"],
+      "no-tabs": ["error", { "allowIndentationTabs": true }],
+      "max-len": ["error", { "code": 130 }],
+      "no-var": "error",
+      "semi": "error",
+      "no-multi-spaces": "error",
+      "space-in-parens": "error",
+      "no-multiple-empty-lines": "error",
+      "prefer-const": "error",
+      "no-use-before-define": "error"
+    }
+  }
+

.husky/pre-commit

@@ -0,0 +1,4 @@
+#!/bin/sh
+. "$(dirname "$0")/_/husky.sh"
+
+lint-staged

.prettierrc.json

@@ -0,0 +1,8 @@
+{
+	"semi": true,
+	"trailingComma": "all",
+	"singleQuote": true,
+	"printWidth": 80,
+	"tabWidth": 2,
+	"arrowParens": "avoid"
+}

package.json

@@ -1,19 +1,32 @@
 {
-  "name": "hackerrank",
-  "version": "1.0.0",
-  "description": "Solutions for HackerRank Problems in Javascript.",
-  "main": "index.js",
-  "scripts": {
-    "test": "mocha --recursive",
-    "report": "nyc mocha --recursive"
-  },
-  "author": "",
-  "license": "ISC",
-  "dependencies": {
-    "chai": "^4.2.0",
-    "mocha": "^6.2.1"
-  },
-  "devDependencies": {
-    "nyc": "^14.1.1"
-  }
+	"name": "hackerrank",
+	"version": "1.0.0",
+	"description": "Solutions for HackerRank Problems in Javascript.",
+	"main": "index.js",
+	"scripts": {
+		"test": "mocha --recursive",
+		"report": "nyc mocha --recursive",
+		"prepare": "husky install"
+	},
+	"lint-staged": {
+		"*.js": [
+			"npx pretty-quick --staged",
+			"eslint --fix"
+		]
+	},
+	"author": "",
+	"license": "ISC",
+	"dependencies": {
+		"chai": "^4.2.0",
+		"mocha": "^6.2.1"
+	},
+	"devDependencies": {
+		"eslint": "7.32.0",
+		"eslint-config-airbnb-base": "14.2.1",
+		"eslint-plugin-import": "2.24.2",
+		"husky": "7.0.2",
+		"lint-staged": "11.2.1",
+		"nyc": "^14.1.1",
+		"prettier": "2.4.1"
+	}
 }

test/Arrays/birthday-cake-candles.test.js

@@ -1,28 +1,28 @@
-const birthdayCakeCandles = require("../../Arrays/birthday-cake-candles");
-const { describe, it } = require("mocha");
-const { expect } = require("chai");
+const { describe, it } = require('mocha');
+const { expect } = require('chai');
+const birthdayCakeCandles = require('../../Arrays/birthday-cake-candles');
 
-describe("Birthday Cake Candles", () => {
-  it("returns 0 for empty array", () => {
-    expect(birthdayCakeCandles([])).to.equal(0);
-  });
+describe('Birthday Cake Candles', () => {
+	it('returns 0 for empty array', () => {
+		expect(birthdayCakeCandles([])).to.equal(0);
+	});
 
-  it("returns 1 if there is only one candle", () => {
-    expect(birthdayCakeCandles([1])).to.equal(1);
-    expect(birthdayCakeCandles([2])).to.equal(1);
-    expect(birthdayCakeCandles([3])).to.equal(1);
-  });
+	it('returns 1 if there is only one candle', () => {
+		expect(birthdayCakeCandles([1])).to.equal(1);
+		expect(birthdayCakeCandles([2])).to.equal(1);
+		expect(birthdayCakeCandles([3])).to.equal(1);
+	});
 
-  it("returns 2 if there are two candles with the same height", () => {
-    expect(birthdayCakeCandles([1, 1])).to.equal(2);
-    expect(birthdayCakeCandles([2, 2])).to.equal(2);
-    expect(birthdayCakeCandles([3, 3])).to.equal(2);
-  });
+	it('returns 2 if there are two candles with the same height', () => {
+		expect(birthdayCakeCandles([1, 1])).to.equal(2);
+		expect(birthdayCakeCandles([2, 2])).to.equal(2);
+		expect(birthdayCakeCandles([3, 3])).to.equal(2);
+	});
 
-  it("returns correct amount for array with different sized candles", () => {
-    expect(birthdayCakeCandles([3, 2, 1, 3])).to.equal(2);
-    expect(birthdayCakeCandles([3, 2, 1, 3, 4, 5, 4])).to.equal(1);
-    expect(birthdayCakeCandles([3, 2, 1, 1, 2, 2, 4, 4, 4])).to.equal(3);
-    expect(birthdayCakeCandles([3, 2, 1])).to.equal(1);
-  });
+	it('returns correct amount for array with different sized candles', () => {
+		expect(birthdayCakeCandles([3, 2, 1, 3])).to.equal(2);
+		expect(birthdayCakeCandles([3, 2, 1, 3, 4, 5, 4])).to.equal(1);
+		expect(birthdayCakeCandles([3, 2, 1, 1, 2, 2, 4, 4, 4])).to.equal(3);
+		expect(birthdayCakeCandles([3, 2, 1])).to.equal(1);
+	});
 });