[js][bonus] Add examples

examples/js/js-bonus-01_base/.gitignore

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+node_modules/
+.tmp/

examples/js/js-bonus-01_base/babel.config.json

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+{
+    "presets": ["@babel/preset-env"],
+    "plugins": ["@babel/plugin-proposal-class-properties"]
+}

examples/js/js-bonus-01_base/jest.config.js

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+module.exports = {
+    testEnvironment: 'node',
+    verbose: true,
+    cacheDirectory: './.tmp/jestCache',
+    transform: {'^.+\\.js$': 'babel-jest'},
+    testMatch:[ "**/tests/**/*.[jt]s?(x)", "**/?(*.)+(spec|test).[jt]s?(x)" ],
+    moduleFileExtensions: ['js']
+};

examples/js/js-bonus-01_base/package.json

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+{
+  "name": "bonus",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "jest"
+  },
+  "author": "",
+  "license": "ISC",
+  "jest": {
+    "moduleFileExtensions": [
+      "js",
+      "jsx"
+    ],
+    "moduleDirectories": [
+      "node_modules",
+      "src"
+    ]
+  },
+  "devDependencies": {
+    "@babel/core": "^7.11.6",
+    "@babel/plugin-proposal-class-properties": "^7.10.4",
+    "@babel/preset-env": "^7.11.5",
+    "@jest/globals": "^26.4.2",
+    "jest": "^26.4.2"
+  }
+}

examples/js/js-bonus-01_base/src/DailyBonusPointsCalculator.js

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+export class DailyBonusPointsCalculator {
+    PREMIUM_USER_POINTS_PER_DAY   = 20;
+    NORMAL_USER_POINTS_PER_DAY    = 10;
+    PREMIUM_USER_WEEKS_MULTIPLIER = 1.5;
+
+    calculate(consecutiveDays, isPremium = false) {
+        if (isPremium) {
+            const consecutiveWeeks = Math.floor(consecutiveDays / 7);
+
+            let consecutiveWeeksMultiplier = 1;
+            if (consecutiveWeeks > 0) {
+                consecutiveWeeksMultiplier = Math.pow(this.PREMIUM_USER_WEEKS_MULTIPLIER, consecutiveWeeks);
+            }
+
+            return consecutiveDays * this.PREMIUM_USER_POINTS_PER_DAY * consecutiveWeeksMultiplier;
+        } else {
+            return consecutiveDays * this.NORMAL_USER_POINTS_PER_DAY;
+        }
+    }
+}

examples/js/js-bonus-01_base/tests/DailyBonusPointsCalculator.test.js

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+import {DailyBonusPointsCalculator} from "../src/DailyBonusPointsCalculator";
+
+describe('DailyBonusPointsCalculator should', () => {
+    it('Calculate points for a normal user on its first day', () => {
+        const calculator = new DailyBonusPointsCalculator();
+
+        expect(calculator.calculate(1)).toBe(10);
+    });
+
+    it('Calculate points for a normal user on its second consecutive week', () => {
+        const calculator = new DailyBonusPointsCalculator();
+
+        expect(calculator.calculate(14)).toBe(140);
+    });
+
+    it('Calculate points for a premium user on its first day', () => {
+        const calculator = new DailyBonusPointsCalculator();
+
+        expect(calculator.calculate(1, true)).toBe(20);
+    });
+
+    it('Calculate points for a premium user on its second consecutive week', () => {
+        const calculator = new DailyBonusPointsCalculator();
+
+        expect(calculator.calculate(14, true)).toBe(630);
+    });
+});

examples/js/js-bonus-02_explicit_method/.gitignore

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+node_modules/
+.tmp/

examples/js/js-bonus-02_explicit_method/babel.config.json

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+{
+    "presets": ["@babel/preset-env"],
+    "plugins": ["@babel/plugin-proposal-class-properties"]
+}

examples/js/js-bonus-02_explicit_method/jest.config.js

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+module.exports = {
+    testEnvironment: 'node',
+    verbose: true,
+    cacheDirectory: './.tmp/jestCache',
+    transform: {'^.+\\.js$': 'babel-jest'},
+    testMatch:[ "**/tests/**/*.[jt]s?(x)", "**/?(*.)+(spec|test).[jt]s?(x)" ],
+    moduleFileExtensions: ['js']
+};