[BE] Coding Challenge - Aung Kyaw Htwe

src/problem4/sum-to-n.ts

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+/**
+ * Iterative approach
+ * @param n number
+ * @returns number
+ */
+export const sum_to_n_a = (n: number): number => {
+  let sum = 0;
+  const step = n >= 1 ? 1 : -1;
+
+  for (let i = 1; i !== n + step; i += step) {
+    sum += i;
+  }
+
+  return sum;
+};
+
+/**
+ * Mathematical formula approach
+ * @param n number
+ * @returns number
+ */
+export const sum_to_n_b = (n: number): number => {
+  if (n <= 0) return 0;
+
+  return (n * (n + 1)) / 2;
+};
+
+/**
+ * Recursive approach
+ * @param n number
+ * @returns number
+ */
+export const sum_to_n_c = (n: number): number => {
+  if (n === 0) return 0;
+
+  return n > 0
+    ? n + sum_to_n_c(n - 1)
+    : n + sum_to_n_c(n + 1);
+};

src/problem5/.env.example

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+APP_MODE                    = "local"
+APP_KEY                     = "AUNGKYAWHTWE1234567890"
+
+RUNNING_PORT                = 3000
+API_CORS_ORIGIN             = "*"
+
+MONGO_URL                   = ""
+MONGO_DBNAME                = "users-api"
+
+AUTH_USERNAME               = "Admin"
+AUTH_PASSWORD               = "PASSWORD123"

src/problem5/.eslintignore

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+node_modules

src/problem5/.eslintrc.js

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+module.exports = {
+  env: {
+    browser: true,
+    es2021: true,
+  },
+  extends: ["eslint:recommended", "plugin:@typescript-eslint/recommended"],
+  overrides: [
+    {
+      env: {
+        node: true,
+      },
+      files: [".eslintrc.{js,cjs}"],
+      parserOptions: {
+        sourceType: "script",
+      },
+    },
+  ],
+  parser: "@typescript-eslint/parser",
+  parserOptions: {
+    ecmaVersion: "latest",
+    sourceType: "module",
+  },
+  plugins: ["@typescript-eslint"],
+  rules: {
+    "no-console": "error",
+    "no-namespace": "off",
+    "no-invalid-regexp": "error",
+    "no-case-declarations": "off",
+    "no-unused-vars": "off",
+    "no-var-requires": "off",
+    "semi": ["error", "always"],
+    "security/detect-object-injection": "off",
+    "indent": ['error', 2, { FunctionDeclaration: { parameters: 'first' } }],
+    "no-trailing-spaces": 'error',
+    "eol-last": ['error', 'always']
+  },
+};

src/problem5/.gitattributes

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+# Auto detect text files and perform LF normalization
+* text=auto

src/problem5/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# 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
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional stylelint cache
+.stylelintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+.temp
+.cache
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*

src/problem5/.prettierignore

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+node_modules

src/problem5/.prettierrc

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+{
+    "singleQuote": true,
+    "printWidth": 125
+}

src/problem5/.vscode/settings.json

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+{
+  "editor.formatOnSave": true,
+  "[javascript]": {
+    "editor.formatOnSave": false
+  },
+  "[typescript]": {
+    "editor.formatOnSave": false
+  },
+  "editor.codeActionsOnSave": {
+    "source.fixAll.eslint": "explicit"
+  },
+  "search.exclude": {
+    "**/node_modules": true
+  },
+  "prettier.useTabs": true,
+  "prettier.tabWidth": 2,
+  "prettier.singleQuote": true,
+  "editor.snippetSuggestions": "top"
+}