Merge pull request #1 from jakubjirous/feature/plus-minus

1) Plus Minus

Author: Jakub Jirous

.eslintrc.json

@@ -1,15 +1,6 @@
 {
- "env": {
- "browser": true,
- "es2021": true
- },
- "extends": "standard-with-typescript",
- "overrides": [
- ],
- "parserOptions": {
- "ecmaVersion": "latest",
- "sourceType": "module"
- },
- "rules": {
- }
+ "extends": ["eslint:recommended", "plugin:@typescript-eslint/recommended"],
+ "parser": "@typescript-eslint/parser",
+ "plugins": ["@typescript-eslint"],
+ "root": true
 }

README.md

@@ -6,3 +6,21 @@ Developers compete by writing programs according to provided specifications.
 
 ---
 
+<p align="center">
+ <img src="https://sonarcloud.io/images/project_badges/sonarcloud-white.svg" alt="Sonar Cloud">
+</p>
+
+<p align="center">
+ <img src="https://sonarcloud.io/api/project_badges/measure?jakubjirous_hacker-rank-code-challenge&metric=coverage" alt="Coverage">
+ <img src="https://sonarcloud.io/api/project_badges/measure?jakubjirous_hacker-rank-code-challenge&metric=code_smells" alt="Code Smells">
+ <img src="https://sonarcloud.io/api/project_badges/measure?jakubjirous_hacker-rank-code-challenge&metric=ncloc" alt="Lines of Code">
+</p>
+
+---
+
+## Challenges in TypeScript
+
+### Preparation Kit
+
+1. [Plus Minus](/src/challenges/01-plus-minus/)
+

package.json

@@ -19,6 +19,7 @@
  "homepage": "https://github.com/jakubjirous/hacker-rank-code-challenge#readme",
  "scripts": {
  "build": "tsc",
+ "lint": "eslint . --ext .ts",
  "test": "jest",
  "test:w": "jest --watch",
  "test:wa": "jest --watchAll",
@@ -63,13 +64,15 @@
  },
  "devDependencies": {
  "@types/jest": "^29.2.4",
- "@typescript-eslint/eslint-plugin": "^5.0.0",
- "eslint": "^8.0.1",
+ "@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": "*"
+ "typescript": "^4.9.4"
  }
 }

sonar-project.properties

@@ -0,0 +1,15 @@
+sonar.projectKey=jakubjirous_hacker-rank-code-challenge
+sonar.organization=jakubjirous
+
+# This is the name and version displayed in the SonarCloud UI.
+sonar.projectName=edabit-code-challenge
+sonar.projectVersion=1.0
+
+# Path is relative to the sonar-project.properties file. Replace "\" by "/" on Windows.
+sonar.sources=src/
+
+# Encoding of the source code. Default is default system encoding
+#sonar.sourceEncoding=UTF-8
+
+sonar.coverage.exclusions=src/**/test/**/*
+sonar.javascript.lcov.reportPaths=./coverage/lcov.info

src/challenges/01-plus-minus/plus-minus.ts

@@ -0,0 +1,44 @@
+/**
+ * Given an array of integers, calculate the ratios of its elements that are positive, negative, and zero.
+ * Print the decimal value of each fraction on a new line with 6 places after the decimal.
+ *
+ * Note:
+ * - This challenge introduces precision problems.
+ * - The test cases are scaled to six decimal places, though answers with absolute error of up to 10^-4 are acceptable.
+ *
+ * Output Format:
+ * - Print the following lines, each to decimals:
+ * - 1) proportion of positive values
+ * - 2) proportion of negative values
+ * - 3) proportion of zeros
+ *
+ * Example:
+ * - arr = [1, 1, 0, -1, -1]
+ * - There are n = 5 elements, two positive, two negative and one zero.
+ * - Their ratios are 2/5 = 0.400000, 2/5 = 0.400000 and 1/5 = 0.200000.
+ * - Results are printed as:
+ * - 0.400000
+ * - 0.400000
+ * - 0.200000
+ *
+ * @param inputArray
+ */
+export const plusMinus = (inputArray: number[]): string => {
+ return inputArray
+ .reduce(
+ (acc, value) => {
+ let [positives, negatives, zeros] = acc;
+
+ return [
+ value > 0 ? ++positives : positives,
+ value < 0 ? ++negatives : negatives,
+ value === 0 ? ++zeros : zeros,
+ ];
+ },
+ [0, 0, 0]
+ )
+ .reduce(
+ (acc, value) => acc + `${(value / inputArray.length).toFixed(6)}\n`,
+ ""
+ );
+};

src/challenges/01-plus-minus/test/plus-minus.test.ts

@@ -0,0 +1,66 @@
+import { plusMinus } from "../plus-minus";
+
+type FirstArg = number[];
+type ExpectedResult = string;
+type Cases = [FirstArg, ExpectedResult][];
+
+/**
+ *
+ */
+describe("Plus Minus", () => {
+ const cases: Cases = [
+ [[0, 0, -1, 1, 1], "0.400000\n0.200000\n0.400000"],
+ [[-4, 3, -9, 0, 4, 1], "0.500000\n0.333333\n0.166667"],
+ [[1, -2, -7, 9, 1, -8, -5], "0.428571\n0.571429\n0.000000"],
+ [[0, 4, -3, 3, -6], "0.400000\n0.400000\n0.200000"],
+ [
+ [
+ 55, 48, 48, 45, 91, 97, 45, 1, 39, 54, 36, 6, 19, 35, 66, 36, 72, 93,
+ 38, 21, 65, 70, 36, 63, 39, 76, 82, 26, 67, 29, 24, 82, 62, 53, 1, 50,
+ 47, 65, 67, 19, 66, 90, 77,
+ ],
+ "1.000000\n0.000000\n0.000000",
+ ],
+ [[0, 100, 35, 0, 94, 40, 42, 87, 59, 0], "0.700000\n0.000000\n0.300000"],
+ [
+ [
+ 0, -67, -74, -38, -72, -53, 0, -13, -95, -91, -100, -59, 0, -10, -68,
+ -71, -62, -21, 0, -42, -57, -16, -66, -23, 0, -80, -63, -68, -65, -71,
+ 0, -71, -15, -32, -26, -8, 0, -6, -51, -87, -19, -71, 0, -93, -26, -35,
+ -56, -89, 0, -21, -74, -39, -57, -8, 0, -69, -29, -24, -99, -53, 0, -65,
+ -42, -72, -18, -4, 0, -73, -46, -63, -78, -87,
+ ],
+ "0.000000\n0.833333\n0.166667",
+ ],
+ [
+ [
+ -92, -21, -93, -27, -45, -63, 53, 45, 0, 6, -67, 84, 96, 86, 18, 36, 53,
+ 0, 47, 88, 91, -59, 65, 62, 3, 13, 0, -49, -47, 94, -63, 65, -23, 48,
+ -5, 0, -10, 67, -23, 19, -11, 46, 80, -83, 0, -40, 74, -63, -20, -72,
+ 98, -72, 66, 0, -58, -1, 67, -22, 8, -45, 32, -65, 0, -10, -65, -81,
+ -36, -55, -99, -18, -82,
+ ],
+ "0.408451\n0.492958\n0.098592",
+ ],
+ [
+ [
+ -6, 1, 79, 17, 64, 94, 87, -77, 0, -26, 2, -94, 87, -81, -73, -28, 43,
+ 0, -35, 39, -37, -49, -29, 93, 64, 54, 0, -73, -58, -100, 33, -75, -47,
+ 35, -7, 0, 52, -37, -99, 58, -23, 70, -52, 18, 0, -79, -38, 45, -61, 45,
+ 51, -48, 32, 0, -44, -56, 29, -74, -1, 92, -93, 23, 0, 55, -31, 75, -43,
+ 20, 19, 58, -4, 0, 59, -80, 18, -74, 81, 63, 62, -92, 0, -23, 7, -91,
+ 22, -1, 38, -73, 79, 0, -2, 90, 80, 74, -74, -85, -48, 31, 0, -80,
+ ],
+ "0.440000\n0.450000\n0.110000",
+ ],
+ [[1, 2, 3, -1, -2, -3, 0, 0], "0.375000\n0.375000\n0.250000"],
+ ];
+
+ test.each(cases)(
+ "for array of integers %p output should be %p",
+ (firstArg, expectedResult) => {
+ const result = plusMinus(firstArg);
+ expect(result.trim()).toEqual(expectedResult.trim());
+ }
+ );
+});

yarn.lock

@@ -764,7 +764,7 @@
  dependencies:
  "@types/yargs-parser" "*"
 
-"@typescript-eslint/eslint-plugin@^5.0.0":
+"@typescript-eslint/eslint-plugin@^5.48.0":
  version "5.48.0"
  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-5.48.0.tgz#54f8368d080eb384a455f60c2ee044e948a8ce67"
  integrity sha512-SVLafp0NXpoJY7ut6VFVUU9I+YeFsDzeQwtK0WZ+xbRN3mtxJ08je+6Oi2N89qDn087COdO0u3blKZNv9VetRQ==
@@ -779,7 +779,7 @@
  semver "^7.3.7"
  tsutils "^3.21.0"
 
-"@typescript-eslint/parser@^5.0.0":
+"@typescript-eslint/parser@^5.0.0", "@typescript-eslint/parser@^5.48.0":
  version "5.48.0"
  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-5.48.0.tgz#02803355b23884a83e543755349809a50b7ed9ba"
  integrity sha512-1mxNA8qfgxX8kBvRDIHEzrRGrKHQfQlbW6iHyfHYS0Q4X1af+S6mkLNtgCOsGVl8+/LUPrqdHMssAemkrQ01qg==
@@ -1371,6 +1371,11 @@ escape-string-regexp@^4.0.0:
  resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-4.0.0.tgz#14ba83a5d373e3d311e5afca29cf5bfad965bf34"
  integrity sha512-TtpcNJ3XAzx3Gq8sWRzJaVajRs0uVxA2YAkdb1jm2YkPz4G6egUFAyA3n5vtEIZefPk5Wa4UXbKuS5fKkJWdgA==
 
+eslint-config-google@^0.14.0:
+ version "0.14.0"
+ resolved "https://registry.yarnpkg.com/eslint-config-google/-/eslint-config-google-0.14.0.tgz#4f5f8759ba6e11b424294a219dbfa18c508bcc1a"
+ integrity sha512-WsbX4WbjuMvTdeVL6+J3rK1RGhCTqjsFjX7UMSMgZiyxxaNLkoJENbrGExzERFeoTpGw3F3FypTiWAP9ZXzkEw==
+
 eslint-config-standard-with-typescript@^24.0.0:
  version "24.0.0"
  resolved "https://registry.yarnpkg.com/eslint-config-standard-with-typescript/-/eslint-config-standard-with-typescript-24.0.0.tgz#30e83b580380fd71477bf80bcb5405e8a46f555f"
@@ -1490,7 +1495,7 @@ eslint-visitor-keys@^3.3.0:
  resolved "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-3.3.0.tgz#f6480fa6b1f30efe2d1968aa8ac745b862469826"
  integrity sha512-mQ+suqKJVyeuwGYHAdjMFqjCyfl8+Ldnxuyp3ldiMBFKkvytrXUZWaiPCEav8qDHKty44bD+qV1IP4T+w+xXRA==
 
-eslint@^8.0.1:
+eslint@^8.31.0:
  version "8.31.0"
  resolved "https://registry.yarnpkg.com/eslint/-/eslint-8.31.0.tgz#75028e77cbcff102a9feae1d718135931532d524"
  integrity sha512-0tQQEVdmPZ1UtUKXjX7EMm9BlgJ08G90IhWh0PKDCb3ZLsgAOHI8fYSIzYVZej92zsgq+ft0FGsxhJ3xo2tbuA==
@@ -3225,7 +3230,7 @@ type-fest@^0.21.3:
  resolved "https://registry.yarnpkg.com/type-fest/-/type-fest-0.21.3.tgz#d260a24b0198436e133fa26a524a6d65fa3b2e37"
  integrity sha512-t0rzBq87m3fVcduHDUFhKmyyX+9eo6WQjZvf51Ea/M0Q7+T374Jp1aUiyUl0GKxp8M/OETVHSDvmkyPgvX+X2w==
 
-typescript@*:
+typescript@^4.9.4:
  version "4.9.4"
  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.9.4.tgz#a2a3d2756c079abda241d75f149df9d561091e78"
  integrity sha512-Uz+dTXYzxXXbsFpM86Wh3dKCxrQqUcVMxwU54orwlJjOpO3ao8L7j5lH+dWfTwgCwIuM9GQ2kvVotzYJMXTBZg==