add kata

6kyu/replace-with-alphabet-position/description.md

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+Welcome.
+
+In this kata you are required to, given a string, replace every letter with its position in the alphabet.
+
+If anything in the text isn't a letter, ignore it and don't return it.
+
+"a" = 1, "b" = 2, etc.
+
+Example
+```
+Input = "The sunset sets at twelve o' clock."
+Output = "20 8 5 19 21 14 19 5 20 19 5 20 19 1 20 20 23 5 12 22 5 15 3 12 15 3 11"
+```

6kyu/replace-with-alphabet-position/solution.ts

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+export function alphabetPosition(text: string): string {
+  const alphabet = 'abcdefghijklmnopqrstuvwxyz';
+  const indexArray = [...text]
+    .map((char) => alphabet.indexOf(char.toLowerCase()))
+    .filter((index) => index !== -1)
+    .map((index) => index + 1);
+  return indexArray.join(' ');
+}

6kyu/replace-with-alphabet-position/tests.ts

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+import { assert } from "chai";
+
+import { alphabetPosition } from "./solution";
+
+describe("Tests", () => {
+  it("test", () => {
+    assert.equal(alphabetPosition("The sunset sets at twelve o' clock."), "20 8 5 19 21 14 19 5 20 19 5 20 19 1 20 20 23 5 12 22 5 15 3 12 15 3 11");
+    assert.equal(alphabetPosition("The narwhal bacons at midnight."), "20 8 5 14 1 18 23 8 1 12 2 1 3 15 14 19 1 20 13 9 4 14 9 7 8 20");
+  });
+});