This is a solution for https://github.com/cyriux/Monoidz-kata/ in TypeScript
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Panini Kata
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| node_modules | |
| package-lock.json |
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| { | |
| "useTabs": true, | |
| "overrides": [ | |
| { | |
| "files": "*.md", | |
| "options": { | |
| "printWidth": 70, | |
| "useTabs": false, | |
| "trailingComma": "none", | |
| "proseWrap": "never" | |
| } | |
| } | |
| ] | |
| } |
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| module.exports = { | |
| preset: "ts-jest", | |
| testEnvironment: "node" | |
| }; |
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| import { Food, combineFood, neutralFood, combineDiet, Diet } from "./kata"; | |
| const salad: Food = { | |
| dietCompatibility: "vegan", | |
| organic: true, | |
| fat: 0, | |
| salt: 0, | |
| calories: 50 | |
| }; | |
| const bread: Food = { | |
| dietCompatibility: "vegan", | |
| organic: true, | |
| fat: 2, | |
| salt: 0.2, | |
| calories: 100000 | |
| }; | |
| const ham: Food = { | |
| dietCompatibility: "omnivore", | |
| organic: false, | |
| fat: 150, | |
| salt: 0.1, | |
| calories: 30000 | |
| }; | |
| describe("combineFood", () => { | |
| it("calculates panini with two ingredients", () => { | |
| expect([ham, salad].reduce(combineFood)).toStrictEqual({ | |
| dietCompatibility: "omnivore", | |
| organic: false, | |
| fat: 150, | |
| salt: 0.1, | |
| calories: 30050 | |
| }); | |
| expect([bread, salad].reduce(combineFood)).toStrictEqual({ | |
| dietCompatibility: "vegan", | |
| organic: true, | |
| fat: 2, | |
| salt: 0.2, | |
| calories: 100050 | |
| }); | |
| }); | |
| it("equals itself when combined with neutral food", () => { | |
| [bread, salad, ham].forEach(ingredient => { | |
| expect(combineFood(neutralFood, ingredient)).toStrictEqual(ingredient); | |
| expect(combineFood(ingredient, neutralFood)).toStrictEqual(ingredient); | |
| }); | |
| }); | |
| it("is associative", () => { | |
| expect(combineFood(combineFood(ham, bread), salad)).toStrictEqual( | |
| combineFood(ham, combineFood(bread, salad)) | |
| ); | |
| }); | |
| describe("combineDiet", () => { | |
| it("combines diet compatibility", () => { | |
| expect(combineDiet("vegan", "vegetarian")).toEqual("vegetarian"); | |
| expect(combineDiet("omnivore", "vegetarian")).toEqual("omnivore"); | |
| }); | |
| it("equals itself when combined with neutral diet compatibility", () => { | |
| const diets: Diet[] = ["vegan", "vegetarian", "pescetarian", "omnivore"]; | |
| diets.forEach(diet => { | |
| expect(combineDiet(diet, "vegan")).toStrictEqual(diet); | |
| expect(combineDiet("vegan", diet)).toStrictEqual(diet); | |
| }); | |
| }); | |
| it("is associative", () => { | |
| expect( | |
| combineDiet("vegetarian", combineDiet("vegan", "pescetarian")) | |
| ).toStrictEqual( | |
| combineDiet(combineDiet("vegetarian", "vegan"), "pescetarian") | |
| ); | |
| }); | |
| }); | |
| }); |
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| export interface Food { | |
| dietCompatibility: Diet; | |
| organic: boolean; | |
| fat: number; | |
| salt: number; | |
| calories: number; | |
| } | |
| export const neutralFood: Food = { | |
| dietCompatibility: "vegan", | |
| organic: true, | |
| fat: 0, | |
| salt: 0, | |
| calories: 0 | |
| }; | |
| export function combineFood(a: Food, b: Food): Food { | |
| return { | |
| dietCompatibility: combineDiet(a.dietCompatibility, b.dietCompatibility), | |
| organic: a.organic && b.organic, | |
| fat: a.fat + b.fat, | |
| salt: a.salt + b.salt, | |
| calories: a.calories + b.calories | |
| }; | |
| } | |
| export type Diet = "vegan" | "vegetarian" | "pescetarian" | "omnivore"; | |
| function getDietCompatibility(diet: Diet): Diet[] { | |
| switch (diet) { | |
| case "vegan": | |
| return ["vegan", "vegetarian", "pescetarian", "omnivore"]; | |
| case "vegetarian": | |
| return ["vegetarian", "pescetarian", "omnivore"]; | |
| case "pescetarian": | |
| return ["pescetarian", "omnivore"]; | |
| case "omnivore": | |
| default: | |
| return ["omnivore"]; | |
| } | |
| } | |
| function intersection<T>(a: T[], b: T[]): T[] { | |
| const countedElements: Map<T, number> = [...a, ...b].reduce( | |
| (acc: Map<T, number>, a: T) => { | |
| const currentValue = acc.get(a) || 0; | |
| acc.set(a, currentValue + 1); | |
| return acc; | |
| }, | |
| new Map() | |
| ); | |
| return Array.from(countedElements.entries()) | |
| .filter(([k, v]) => v > 1) | |
| .reduce<T[]>((acc, [k, v]) => [...acc, k], []); | |
| } | |
| export function combineDiet(a: Diet, b: Diet): Diet { | |
| const compatibilities = intersection( | |
| getDietCompatibility(a), | |
| getDietCompatibility(b) | |
| ); | |
| return compatibilities.reduce( | |
| (acc, diet) => | |
| getDietCompatibility(acc).length > getDietCompatibility(diet).length | |
| ? acc | |
| : diet, | |
| "omnivore" | |
| ); | |
| } |
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| { | |
| "name": "panini-kata", | |
| "private": "true", | |
| "scripts": { | |
| "test": "jest", | |
| "posttest": "npm run format", | |
| "format": "prettier --loglevel warn --write \"**/*.{ts,js,css,md}\"" | |
| }, | |
| "devDependencies": { | |
| "@types/jest": "^25.1.2", | |
| "@types/node": "^13.7.0", | |
| "husky": "^4.2.1", | |
| "jest": "^25.1.0", | |
| "lint-staged": "^10.0.7", | |
| "prettier": "^1.19.1", | |
| "ts-jest": "^25.2.0", | |
| "typescript": "^3.7.5" | |
| }, | |
| "husky": { | |
| "hooks": { | |
| "pre-commit": "lint-staged" | |
| } | |
| }, | |
| "lint-staged": { | |
| "*.{ts,js,css,md}": "prettier --write" | |
| } | |
| } |
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| { | |
| "compilerOptions": { | |
| /* Basic Options */ | |
| // "incremental": true, /* Enable incremental compilation */ | |
| "target": "es5", /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */ | |
| "module": "commonjs", /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */ | |
| // "lib": [], /* Specify library files to be included in the compilation. */ | |
| // "allowJs": true, /* Allow javascript files to be compiled. */ | |
| // "checkJs": true, /* Report errors in .js files. */ | |
| // "jsx": "preserve", /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */ | |
| // "declaration": true, /* Generates corresponding '.d.ts' file. */ | |
| // "declarationMap": true, /* Generates a sourcemap for each corresponding '.d.ts' file. */ | |
| // "sourceMap": true, /* Generates corresponding '.map' file. */ | |
| // "outFile": "./", /* Concatenate and emit output to single file. */ | |
| // "outDir": "./", /* Redirect output structure to the directory. */ | |
| // "rootDir": "./", /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */ | |
| // "composite": true, /* Enable project compilation */ | |
| // "tsBuildInfoFile": "./", /* Specify file to store incremental compilation information */ | |
| // "removeComments": true, /* Do not emit comments to output. */ | |
| // "noEmit": true, /* Do not emit outputs. */ | |
| // "importHelpers": true, /* Import emit helpers from 'tslib'. */ | |
| // "downlevelIteration": true, /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */ | |
| // "isolatedModules": true, /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */ | |
| /* Strict Type-Checking Options */ | |
| "strict": true, /* Enable all strict type-checking options. */ | |
| // "noImplicitAny": true, /* Raise error on expressions and declarations with an implied 'any' type. */ | |
| // "strictNullChecks": true, /* Enable strict null checks. */ | |
| // "strictFunctionTypes": true, /* Enable strict checking of function types. */ | |
| // "strictBindCallApply": true, /* Enable strict 'bind', 'call', and 'apply' methods on functions. */ | |
| // "strictPropertyInitialization": true, /* Enable strict checking of property initialization in classes. */ | |
| // "noImplicitThis": true, /* Raise error on 'this' expressions with an implied 'any' type. */ | |
| // "alwaysStrict": true, /* Parse in strict mode and emit "use strict" for each source file. */ | |
| /* Additional Checks */ | |
| // "noUnusedLocals": true, /* Report errors on unused locals. */ | |
| // "noUnusedParameters": true, /* Report errors on unused parameters. */ | |
| // "noImplicitReturns": true, /* Report error when not all code paths in function return a value. */ | |
| // "noFallthroughCasesInSwitch": true, /* Report errors for fallthrough cases in switch statement. */ | |
| /* Module Resolution Options */ | |
| // "moduleResolution": "node", /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */ | |
| // "baseUrl": "./", /* Base directory to resolve non-absolute module names. */ | |
| // "paths": {}, /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */ | |
| // "rootDirs": [], /* List of root folders whose combined content represents the structure of the project at runtime. */ | |
| // "typeRoots": [], /* List of folders to include type definitions from. */ | |
| // "types": [], /* Type declaration files to be included in compilation. */ | |
| // "allowSyntheticDefaultImports": true, /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */ | |
| "esModuleInterop": true, /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */ | |
| // "preserveSymlinks": true, /* Do not resolve the real path of symlinks. */ | |
| // "allowUmdGlobalAccess": true, /* Allow accessing UMD globals from modules. */ | |
| /* Source Map Options */ | |
| // "sourceRoot": "", /* Specify the location where debugger should locate TypeScript files instead of source locations. */ | |
| // "mapRoot": "", /* Specify the location where debugger should locate map files instead of generated locations. */ | |
| // "inlineSourceMap": true, /* Emit a single file with source maps instead of having a separate file. */ | |
| // "inlineSources": true, /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */ | |
| /* Experimental Options */ | |
| // "experimentalDecorators": true, /* Enables experimental support for ES7 decorators. */ | |
| // "emitDecoratorMetadata": true, /* Enables experimental support for emitting type metadata for decorators. */ | |
| /* Advanced Options */ | |
| "forceConsistentCasingInFileNames": true /* Disallow inconsistently-cased references to the same file. */ | |
| } | |
| } |
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