Compare commits

..

2 Commits

Author SHA1 Message Date
2b2fce0c42 add kata 2025-01-31 22:55:24 +01:00
9080e35d7a use mocha and tsx to run tests 2025-01-31 22:51:13 +01:00
7 changed files with 535 additions and 4 deletions

View File

@@ -0,0 +1,18 @@
Find the missing letter
Write a method that takes an array of consecutive (increasing) letters as input and that returns the missing letter in the array.
You will always get an valid array. And it will be always exactly one letter be missing. The length of the array will always be at least 2.
The array will always contain letters in only one case.
Example:
```
['a','b','c','d','f'] -> 'e'
['O','Q','R','S'] -> 'P'
```
(Use the English alphabet with 26 letters!)
Have fun coding it and please don't forget to vote and rank this kata! :-)
I have also created other katas. Take a look if you enjoyed this kata!

View File

@@ -0,0 +1,11 @@
export function findMissingLetter(array: string[]): string {
const alphabet = 'abcdefghijklmnopqrstuvwxyz';
// convert array to alphabet index values
const indexes = array.map((char) => alphabet.indexOf(char.toLowerCase()));
// find the missing index
const missingIndex = indexes.find((index, i) => indexes[i + 1] - index > 1) as number;
const isInputUpperCase = array[0] === array[0].toUpperCase();
const missingLetter = alphabet[missingIndex + 1];
return isInputUpperCase ? missingLetter.toUpperCase() : missingLetter;
}

View File

@@ -0,0 +1,9 @@
import { findMissingLetter } from './solution';
import { assert } from "chai";
describe("solution", function(){
it("exampleTests", function(){
assert.equal(findMissingLetter(['a','b','c','d','f']), 'e');
assert.equal(findMissingLetter(['O','Q','R','S']), 'P');
});
});

492
package-lock.json generated
View File

@@ -15,6 +15,7 @@
"chai": "^5.1.2",
"mocha": "^11.1.0",
"ts-node": "^10.9.2",
"tsx": "^4.19.2",
"typescript": "^5.7.3"
}
},
@@ -31,6 +32,414 @@
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@@ -583,6 +992,46 @@
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"dev": true,
"hasInstallScript": true,
"license": "MIT",
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},
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},
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"@esbuild/android-arm": "0.23.1",
"@esbuild/android-arm64": "0.23.1",
"@esbuild/android-x64": "0.23.1",
"@esbuild/darwin-arm64": "0.23.1",
"@esbuild/darwin-x64": "0.23.1",
"@esbuild/freebsd-arm64": "0.23.1",
"@esbuild/freebsd-x64": "0.23.1",
"@esbuild/linux-arm": "0.23.1",
"@esbuild/linux-arm64": "0.23.1",
"@esbuild/linux-ia32": "0.23.1",
"@esbuild/linux-loong64": "0.23.1",
"@esbuild/linux-mips64el": "0.23.1",
"@esbuild/linux-ppc64": "0.23.1",
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"@esbuild/linux-s390x": "0.23.1",
"@esbuild/linux-x64": "0.23.1",
"@esbuild/netbsd-x64": "0.23.1",
"@esbuild/openbsd-arm64": "0.23.1",
"@esbuild/openbsd-x64": "0.23.1",
"@esbuild/sunos-x64": "0.23.1",
"@esbuild/win32-arm64": "0.23.1",
"@esbuild/win32-ia32": "0.23.1",
"@esbuild/win32-x64": "0.23.1"
}
},
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"version": "3.2.0",
"resolved": "https://registry.npmjs.org/escalade/-/escalade-3.2.0.tgz",
@@ -688,6 +1137,19 @@
"node": "6.* || 8.* || >= 10.*"
}
},
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"version": "4.10.0",
"resolved": "https://registry.npmjs.org/get-tsconfig/-/get-tsconfig-4.10.0.tgz",
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"dev": true,
"license": "MIT",
"dependencies": {
"resolve-pkg-maps": "^1.0.0"
},
"funding": {
"url": "https://github.com/privatenumber/get-tsconfig?sponsor=1"
}
},
"node_modules/glob": {
"version": "10.4.5",
"resolved": "https://registry.npmjs.org/glob/-/glob-10.4.5.tgz",
@@ -1135,6 +1597,16 @@
"node": ">=0.10.0"
}
},
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"dev": true,
"license": "MIT",
"funding": {
"url": "https://github.com/privatenumber/resolve-pkg-maps?sponsor=1"
}
},
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"resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
@@ -1402,6 +1874,26 @@
"node": ">=0.3.1"
}
},
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"dev": true,
"license": "MIT",
"dependencies": {
"esbuild": "~0.23.0",
"get-tsconfig": "^4.7.5"
},
"bin": {
"tsx": "dist/cli.mjs"
},
"engines": {
"node": ">=18.0.0"
},
"optionalDependencies": {
"fsevents": "~2.3.3"
}
},
"node_modules/typescript": {
"version": "5.7.3",
"resolved": "https://registry.npmjs.org/typescript/-/typescript-5.7.3.tgz",

View File

@@ -16,6 +16,7 @@
"chai": "^5.1.2",
"mocha": "^11.1.0",
"ts-node": "^10.9.2",
"tsx": "^4.19.2",
"typescript": "^5.7.3"
}
}

View File

@@ -20,13 +20,13 @@ Each kata has a `tests.ts` file.
To run the tests for a specific kata, run the following command:
```bash
npx mocha -r ts-node/register path/to/specific/tests.ts
npx mocha --import=tsx path/to/specific/tests.ts
```
If you're in the right folder:
```bash
npx mocha -r ts-node/register tests.ts
npx mocha --import=tsx ./tests.ts
```
## Adding a new kata

View File

@@ -11,7 +11,7 @@
// "disableReferencedProjectLoad": true, /* Reduce the number of projects loaded automatically by TypeScript. */
/* Language and Environment */
"target": "es2016", /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
"target": "ESNext", /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
// "lib": [], /* Specify a set of bundled library declaration files that describe the target runtime environment. */
// "jsx": "preserve", /* Specify what JSX code is generated. */
// "experimentalDecorators": true, /* Enable experimental support for legacy experimental decorators. */
@@ -25,7 +25,7 @@
// "moduleDetection": "auto", /* Control what method is used to detect module-format JS files. */
/* Modules */
"module": "commonjs", /* Specify what module code is generated. */
"module": "ESNext", /* Specify what module code is generated. */
// "rootDir": "./", /* Specify the root folder within your source files. */
// "moduleResolution": "node10", /* Specify how TypeScript looks up a file from a given module specifier. */
// "baseUrl": "./", /* Specify the base directory to resolve non-relative module names. */