Resistor color duo

typescript/resistor-color-duo/.eslintignore

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+!.meta
+
+# Protected or generated
+.git
+.vscode
+
+# When using npm
+node_modules/*
+
+# Configuration files
+babel.config.js
+jest.config.js

typescript/resistor-color-duo/.eslintrc

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+{
+  "root": true,
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "project": "./tsconfig.json",
+    "ecmaFeatures": {
+      "jsx": true
+    },
+    "ecmaVersion": 2020,
+    "sourceType": "module"
+  },
+  "extends": "@exercism/eslint-config-typescript",
+  "env": {
+    "jest": true
+  },
+  "overrides": [
+    {
+      "files": [".meta/proof.ci.ts", ".meta/exemplar.ts", "*.test.ts"],
+      "excludedFiles": ["custom.test.ts"],
+      "extends": "@exercism/eslint-config-typescript/maintainers"
+    }
+  ]
+}

typescript/resistor-color-duo/.exercism/config.json

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+{
+  "blurb": "Convert color codes, as used on resistors, to a numeric value.",
+  "authors": ["msomji"],
+  "contributors": ["EduardoBautista", "SleeplessByte"],
+  "files": {
+    "solution": ["resistor-color-duo.ts"],
+    "test": ["resistor-color-duo.test.ts"],
+    "example": [".meta/proof.ci.ts"]
+  },
+  "source": "Maud de Vries, Erik Schierboom",
+  "source_url": "https://github.com/exercism/problem-specifications/issues/1464"
+}

typescript/resistor-color-duo/.exercism/metadata.json

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+{"track":"typescript","exercise":"resistor-color-duo","id":"0b14018ea67d4f2fbb7d817a164d20ed","url":"https://exercism.org/tracks/typescript/exercises/resistor-color-duo","handle":"JBiason","is_requester":true,"auto_approve":false}

typescript/resistor-color-duo/HELP.md

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+# Help
+
+## Running the tests
+
+Execute the tests with:
+
+```bash
+$ yarn test
+```
+
+## Skipped tests
+
+In the test suites all tests but the first have been skipped.
+
+Once you get a test passing, you can enable the next one by changing `xit` to
+`it`.
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit resistor-color-duo.ts` command.
+This command will upload your solution to the Exercism website and print the solution page's URL.
+
+It's possible to submit an incomplete solution which allows you to:
+
+- See how others have completed the exercise
+- Request help from a mentor
+
+## Need to get help?
+
+If you'd like help solving the exercise, check the following pages:
+
+- The [TypeScript track's documentation](https://exercism.org/docs/tracks/typescript)
+- [Exercism's support channel on gitter](https://gitter.im/exercism/support)
+- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
+
+Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
+
+To get help if you're having trouble, you can use one of the following resources:
+
+- [TypeScript QuickStart](https://www.typescriptlang.org/docs/handbook/release-notes/overview.html)
+- [ECMAScript 2015 Language Specification](https://www.ecma-international.org/wp-content/uploads/ECMA-262_6th_edition_june_2015.pdf) (pdf)
+- [Mozilla JavaScript Reference](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference)
+- [/r/typescript](https://www.reddit.com/r/typescript) is the TypeScript subreddit.
+- [StackOverflow](https://stackoverflow.com/questions/tagged/typescript) can be used to search for your problem and see if it has been answered already. You can also ask and answer questions.

typescript/resistor-color-duo/README.md

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+# Resistor Color Duo
+
+Welcome to Resistor Color Duo on Exercism's TypeScript Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+If you want to build something using a Raspberry Pi, you'll probably use _resistors_.
+For this exercise, you need to know two things about them:
+
+- Each resistor has a resistance value.
+- Resistors are small - so small in fact that if you printed the resistance value on them, it would be hard to read.
+
+To get around this problem, manufacturers print color-coded bands onto the resistors to denote their resistance values.
+Each band has a position and a numeric value.
+
+The first 2 bands of a resistor have a simple encoding scheme: each color maps to a single number.
+For example, if they printed a brown band (value 1) followed by a green band (value 5), it would translate to the number 15.
+
+In this exercise you are going to create a helpful program so that you don't have to remember the values of the bands.
+The program will take color names as input and output a two digit number, even if the input is more than two colors!
+
+The band colors are encoded as follows:
+
+- Black: 0
+- Brown: 1
+- Red: 2
+- Orange: 3
+- Yellow: 4
+- Green: 5
+- Blue: 6
+- Violet: 7
+- Grey: 8
+- White: 9
+
+From the example above:
+brown-green should return 15
+brown-green-violet should return 15 too, ignoring the third color.
+
+## Source
+
+### Created by
+
+- @msomji
+
+### Contributed to by
+
+- @EduardoBautista
+- @SleeplessByte
+
+### Based on
+
+Maud de Vries, Erik Schierboom - https://github.com/exercism/problem-specifications/issues/1464

typescript/resistor-color-duo/babel.config.js

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+module.exports = {
+  presets: [
+    [
+      '@babel/preset-env',
+      {
+        targets: {
+          node: 'current',
+        },
+        useBuiltIns: 'entry',
+        corejs: '3.17',
+      },
+    ],
+    '@babel/preset-typescript',
+  ],
+  plugins: [
+    '@babel/proposal-class-properties',
+    '@babel/proposal-object-rest-spread',
+    '@babel/plugin-syntax-bigint',
+  ],
+}

typescript/resistor-color-duo/jest.config.js

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+module.exports = {
+  verbose: true,
+  projects: ['<rootDir>'],
+  testMatch: [
+    '**/__tests__/**/*.[jt]s?(x)',
+    '**/test/**/*.[jt]s?(x)',
+    '**/?(*.)+(spec|test).[jt]s?(x)',
+  ],
+  testPathIgnorePatterns: [
+    '/(?:production_)?node_modules/',
+    '.d.ts$',
+    '<rootDir>/test/fixtures',
+    '<rootDir>/test/helpers',
+    '__mocks__',
+  ],
+  transform: {
+    '^.+\\.[jt]sx?$': 'babel-jest',
+  },
+}

typescript/resistor-color-duo/package.json

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+{
+  "name": "@exercism/typescript-resistor-color-duo",
+  "version": "1.0.0",
+  "description": "Exercism exercises in Typescript.",
+  "private": true,
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/exercism/typescript"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.15.5",
+    "@babel/plugin-proposal-class-properties": "^7.14.5",
+    "@babel/plugin-proposal-object-rest-spread": "^7.14.7",
+    "@babel/plugin-syntax-bigint": "^7.8.3",
+    "@babel/preset-env": "^7.15.4",
+    "@babel/preset-typescript": "^7.15.0",
+    "@types/jest": "^26.0.24",
+    "@types/node": "^14.17.14",
+    "@exercism/eslint-config-typescript": "^0.3.0",
+    "babel-jest": "^26.6.3",
+    "core-js": "^3.17.2",
+    "eslint": "^7.32.0",
+    "eslint-plugin-import": "^2.24.2",
+    "jest": "^26.6.3",
+    "typescript": "^4.4.2"
+  },
+  "scripts": {
+    "test": "yarn lint:types && jest --no-cache",
+    "lint": "yarn lint:types && yarn lint:ci",
+    "lint:types": "yarn tsc --noEmit -p .",
+    "lint:ci": "eslint . --ext .tsx,.ts"
+  }
+}

typescript/resistor-color-duo/resistor-color-duo.test.ts

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+import { decodedValue } from './resistor-color-duo'
+
+describe('Resistor Colors', () => {
+  test('Brown and black', () => {
+    expect(decodedValue(['brown', 'black'])).toEqual(10)
+  })
+
+  test('Blue and grey', () => {
+    expect(decodedValue(['blue', 'grey'])).toEqual(68)
+  })
+
+  test('Yellow and violet', () => {
+    expect(decodedValue(['yellow', 'violet'])).toEqual(47)
+  })
+
+  test('Orange and orange', () => {
+    expect(decodedValue(['orange', 'orange'])).toEqual(33)
+  })
+
+  test('Ignore additional colors', () => {
+    expect(decodedValue(['green', 'brown', 'orange'])).toEqual(51)
+  })
+})

typescript/resistor-color-duo/resistor-color-duo.ts

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+let bandColors: { [key: string]: number } = {
+  'black': 0,
+  'brown': 1,
+  'red': 2,
+  'orange': 3,
+  'yellow': 4,
+  'green': 5,
+  'blue': 6,
+  'violet': 7,
+  'grey': 8,
+  'white': 9,
+};
+
+export function decodedValue(colorArray: string[]): number {
+  var firstBand:string = colorArray[0];
+  var secondBand:string = colorArray[1];
+
+  return bandColors[firstBand] * 10 + bandColors[secondBand];
+}

typescript/resistor-color-duo/tsconfig.json

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+{
+  "display": "Configuration for Node LTS",
+  "compilerOptions": {
+    "lib": ["es2020"],
+    "module": "commonjs",
+    "target": "es2020",
+
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+
+    // Because we'll be using babel
+    // Ensure that Babel can safely transpile files in the TypeScript project
+    "isolatedModules": true
+  },
+  "include": ["*", ".meta/*"],
+  "exclude": ["node_modules"]
+}