remove code smell

Author: Jakub Jirous

.eslintrc.json

@@ -0,0 +1,6 @@
+{
+    "extends": ["eslint:recommended", "plugin:@typescript-eslint/recommended"],
+    "parser": "@typescript-eslint/parser",
+    "plugins": ["@typescript-eslint"],
+    "root": true
+}

package.json

@@ -6,13 +6,25 @@
     "type": "git",
     "url": "git+https://github.com/jakubjirous/code-signal.git"
   },
+  "keywords": [
+    "typescript",
+    "jest"
+  ],
   "author": "Jakub Jirous <[email protected]>",
   "license": "MIT",
   "description": "Get your Coding Report and Prepare for Interviews",
   "bugs": {
     "url": "https://github.com/jakubjirous/code-signal/issues"
   },
   "homepage": "https://github.com/jakubjirous/code-signal#readme",
+  "scripts": {
+    "build": "tsc",
+    "lint": "eslint . --ext .ts",
+    "test": "jest",
+    "test:w": "jest --watch",
+    "test:wa": "jest --watchAll",
+    "test:cov": "jest --coverage"
+  },
   "dependencies": {
     "babel-jest": "^29.3.1",
     "babel-plugin-istanbul": "^6.1.1",
@@ -47,22 +59,20 @@
     "jest-worker": "^29.3.1",
     "load-tsconfig": "^0.2.3",
     "source-map": "^0.6.1",
-    "source-map-support": "^0.5.13"
+    "source-map-support": "^0.5.13",
+    "ts-node": "^10.9.1"
   },
   "devDependencies": {
     "@types/jest": "^29.2.4",
+    "@typescript-eslint/eslint-plugin": "^5.48.0",
+    "@typescript-eslint/parser": "^5.48.0",
+    "eslint": "^8.31.0",
+    "eslint-config-google": "^0.14.0",
+    "eslint-config-standard-with-typescript": "^24.0.0",
+    "eslint-plugin-import": "^2.25.2",
+    "eslint-plugin-n": "^15.0.0",
+    "eslint-plugin-promise": "^6.0.0",
     "ts-jest": "^29.0.3",
     "typescript": "^4.9.4"
-  },
-  "scripts": {
-    "build": "tsc",
-    "test": "jest",
-    "test:w": "jest --watch",
-    "test:wa": "jest --watchAll",
-    "test:cov": "jest --coverage"
-  },
-  "keywords": [
-    "typescript",
-    "jest"
-  ]
+  }
 }

src/arcade/intro/04-adjacent-elements-product/adjacent-elements-product.ts

@@ -8,6 +8,6 @@ export type Output = number;
 export const adjacentElementsProduct = (inputArray: Input): Output => {
   return inputArray.reduce((acc, value, index, array) => {
     const nextCase = value * array[index - 1];
-    return nextCase > acc ? (acc = nextCase) : acc;
+    return nextCase > acc ? nextCase : acc;
   }, Number.NEGATIVE_INFINITY);
 };