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Merge pull request #127 from bward/master
atbash-cipher exercise for TypeScript
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‎config.json

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"games",
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"parsing"
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]
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},
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{
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"uuid": "04de61fb-9fde-461c-b306-0b4ce52e2169",
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"slug": "atbash-cipher",
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"core": true,
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"difficulty": 7,
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"topics": [
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"algorithms",
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"arrays",
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"control-flow-(conditionals)",
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"control-flow-(loops)",
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"text-formatting"
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]
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}
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],
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"foregone": [],

‎exercises/atbash-cipher/README.md

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# Atbash Cipher
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Create an implementation of the atbash cipher, an ancient encryption system created in the Middle East.
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The Atbash cipher is a simple substitution cipher that relies on
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transposing all the letters in the alphabet such that the resulting
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alphabet is backwards. The first letter is replaced with the last
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letter, the second with the second-last, and so on.
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An Atbash cipher for the Latin alphabet would be as follows:
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```text
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Plain: abcdefghijklmnopqrstuvwxyz
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Cipher: zyxwvutsrqponmlkjihgfedcba
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```
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It is a very weak cipher because it only has one possible key, and it is
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a simple monoalphabetic substitution cipher. However, this may not have
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been an issue in the cipher's time.
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Ciphertext is written out in groups of fixed length, the traditional group size
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being 5 letters, and punctuation is excluded. This is to make it harder to guess
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things based on word boundaries.
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## Examples
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- Encoding `test` gives `gvhg`
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- Decoding `gvhg` gives `test`
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- Decoding `gsvjf rxpyi ldmul cqfnk hlevi gsvoz abwlt` gives `thequickbrownfoxjumpsoverthelazydog`
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## Setup
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Go through the setup instructions for TypeScript to
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install the necessary dependencies:
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http://exercism.io/languages/typescript
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## Requirements
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Install assignment dependencies:
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```bash
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$ yarn install
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```
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## Making the test suite pass
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Execute the tests with:
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```bash
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$ yarn test
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```
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## Source
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Inspired by the Extreme Startup game [https://github.com/rchatley/extreme_startup](https://github.com/rchatley/extreme_startup)
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## Submitting Incomplete Solutions
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It's possible to submit an incomplete solution so you can see how others have completed the exercise.

‎exercises/atbash-cipher/atbash-cipher.example.ts

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class AtbashCipher {
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private alphabet: string = "abcdefghijklmnopqrstuvwxyz"
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private numbers: string = "0123456789"
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public encode(plainText: string) {
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const lowerCaseLettersOnly = plainText
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.toLowerCase()
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.split("")
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.filter((char) => this.alphabet.includes(char) || this.numbers.includes(char))
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.join("")
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return this.decode(lowerCaseLettersOnly)
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.split("")
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.reduce((accumulator: string[], _, index, array) => {
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if (index % 5 === 0) {
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accumulator.push(array.slice(index, index + 5).join(""))
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}
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return accumulator
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}, [])
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.join(" ")
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}
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public decode(cipherText: string) {
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return cipherText
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.split(" ").join("")
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.split("")
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.map((char) => this.alphabet.includes(char) ? this.alphabet[25 - this.alphabet.indexOf(char)] : char)
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.join("")
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}
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}
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export default AtbashCipher

‎exercises/atbash-cipher/atbash-cipher.test.ts

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import AtbashCipher from './atbash-cipher'
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describe('AtbashCipher', () => {
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let atbash: AtbashCipher
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beforeAll(() => {
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atbash = new AtbashCipher()
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})
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describe("encoding", () => {
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it("encode yes", () => {
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const cipherText = atbash.encode("yes")
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expect(cipherText).toEqual("bvh")
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})
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xit("encode no", () => {
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const cipherText = atbash.encode("no")
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expect(cipherText).toEqual("ml")
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})
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xit("encode OMG", () => {
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const cipherText = atbash.encode("OMG")
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expect(cipherText).toEqual("lnt")
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})
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xit("encode spaces", () => {
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const cipherText = atbash.encode("O M G")
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expect(cipherText).toEqual("lnt")
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})
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xit("encode mindblowingly", () => {
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const cipherText = atbash.encode("mindblowingly")
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expect(cipherText).toEqual("nrmwy oldrm tob")
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})
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xit("encode numbers", () => {
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const cipherText = atbash.encode("Testing,1 2 3, testing.")
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expect(cipherText).toEqual("gvhgr mt123 gvhgr mt")
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})
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xit("encode deep thought", () => {
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const cipherText = atbash.encode("Truth is fiction.")
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expect(cipherText).toEqual("gifgs rhurx grlm")
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})
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xit("encode all the letters", () => {
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const cipherText = atbash.encode("thequickbrownfoxjumpsoverthelazydog")
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expect(cipherText).toEqual("gsvjf rxpyi ldmul cqfnk hlevi gsvoz abwlt")
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})
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})
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xdescribe("decode", () => {
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xit("decode exercism", () => {
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const plainText = atbash.decode("vcvix rhn")
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expect(plainText).toEqual("exercism")
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})
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xit("decode a sentence", () => {
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const cipherText = atbash.decode("zmlyh gzxov rhlug vmzhg vkkrm thglm v")
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expect(cipherText).toEqual("anobstacleisoftenasteppingstone")
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})
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xit("decode numbers", () => {
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const plainText = atbash.decode("gvhgr mt123 gvhgr mt")
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expect(plainText).toEqual("testing123testing")
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})
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xit("decode all the letters", () => {
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const cipherText = atbash.decode("gsvjf rxpyi ldmul cqfnk hlevi gsvoz abwlt")
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expect(cipherText).toEqual("thequickbrownfoxjumpsoverthelazydog")
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})
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})
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})

‎exercises/atbash-cipher/atbash-cipher.ts

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‎exercises/atbash-cipher/package.json

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{
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"name": "xtypescript",
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"version": "1.0.0",
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"description": "Exercism exercises in Typescript.",
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"author": "",
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"private": true,
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"repository": {
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"type": "git",
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"url": "https://github.com/exercism/xtypescript"
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},
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"devDependencies": {},
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"scripts": {
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"test": "tsc --noEmit -p . && jest --no-cache",
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"lint": "tsc --noEmit -p . && tslint \"*.ts?(x)\"",
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"lintci": "tslint \"*.ts?(x)\" --force"
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},
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"dependencies": {
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"@types/jest": "^21.1.5",
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"@types/node": "^8.0.47",
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"jest": "^21.2.1",
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"ts-jest": "^21.1.3",
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"tslint": "^5.8.0",
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"typescript": "^2.5.3"
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},
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"jest": {
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"transform": {
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".(ts|tsx)": "<rootDir>/node_modules/ts-jest/preprocessor.js"
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},
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"testRegex": "(/__tests__/.*|\\.(test|spec))\\.(ts|tsx|js)$",
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"moduleFileExtensions": [
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"ts",
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"tsx",
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"js"
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]
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}
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}

‎exercises/atbash-cipher/tsconfig.json

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{
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"compilerOptions": {
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"target": "es2017",
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"module": "commonjs",
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"alwaysStrict": true,
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"noUnusedLocals": true,
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"noUnusedParameters": true,
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"noImplicitAny": true,
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"strictNullChecks": true,
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"preserveConstEnums": true,
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"noFallthroughCasesInSwitch":true,
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"noImplicitThis":true,
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"noImplicitReturns":true,
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"sourceMap": true,
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"noEmitOnError": true,
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"outDir": "./build"
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},
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"compileOnSave": true,
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"exclude": [
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"node_modules"
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]
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}

‎exercises/atbash-cipher/tslint.json

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{
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"jsRules": {
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"class-name": true,
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"comment-format": [
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true,
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"check-space"
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],
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"indent": [
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true,
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"spaces"
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],
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"no-duplicate-variable": true,
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"no-eval": true,
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"no-trailing-whitespace": true,
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"no-unsafe-finally": true,
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"one-line": [
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true,
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"check-open-brace",
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"check-whitespace"
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],
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"quotemark": [
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false,
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"double"
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],
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"semicolon": [
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true,
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"never"
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],
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"triple-equals": [
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true,
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"allow-null-check"
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],
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"variable-name": [
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true,
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"ban-keywords"
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],
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"whitespace": [
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true,
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"check-branch",
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"check-decl",
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"check-operator",
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"check-separator",
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"check-type"
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]
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},
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"rules": {
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"class-name": true,
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"comment-format": [
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true,
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"check-space"
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],
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"indent": [
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true,
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"spaces"
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],
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"no-eval": true,
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"no-internal-module": true,
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"no-trailing-whitespace": true,
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"no-unsafe-finally": true,
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"no-var-keyword": true,
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"one-line": [
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true,
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"check-open-brace",
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"check-whitespace"
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],
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"semicolon": [
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true,
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"never"
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],
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"triple-equals": [
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true,
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"allow-null-check"
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],
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"typedef-whitespace": [
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true,
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{
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"call-signature": "nospace",
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"index-signature": "nospace",
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"parameter": "nospace",
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"property-declaration": "nospace",
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"variable-declaration": "nospace"
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}
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],
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"variable-name": [
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true,
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"ban-keywords"
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],
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"whitespace": [
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true,
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"check-branch",
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"check-decl",
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"check-operator",
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"check-separator",
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"check-type"
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],
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"no-namespace": true,
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"prefer-for-of": true,
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"only-arrow-functions": [true, "allow-declarations"],
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"no-var-requires": true,
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"no-any": true,
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"curly": true,
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"forin": true,
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"no-arg": true,
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"label-position": true,
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"no-conditional-assignment": true,
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"no-console": [true, "log", "error"],
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"no-construct": true,
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"no-duplicate-variable": true,
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"no-empty": true,
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"no-invalid-this": [true, "check-function-in-method"],
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"no-misused-new": true,
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"no-null-keyword": true,
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"no-string-literal": true,
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"radix": true,
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"typeof-compare": true,
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"use-isnan": true,
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"prefer-const": true,
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"array-type": [true, "array-simple"],
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"arrow-parens": true,
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"new-parens": true,
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"no-consecutive-blank-lines": [true,1],
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"no-parameter-properties": true,
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"no-unnecessary-initializer": true,
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"object-literal-shorthand": true,
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"object-literal-key-quotes": [true, "as-needed"]
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}
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}

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