add intermediate trim ts challenges

Author: diaz-rodrigo

Languages/Typescript/Generics/00106-medium-trim-left.ts

@@ -0,0 +1,46 @@
+/*
+  106 - Trim Left
+  -------
+  by Anthony Fu (@antfu) #medium #template-literal
+
+  ### Question
+
+  Implement `TrimLeft<T>` which takes an exact string type and returns a new string with the whitespace beginning removed.
+
+  For example
+
+  ```ts
+  type trimed = TrimLeft<'  Hello World  '> // expected to be 'Hello World  '
+  ```
+
+  > View on GitHub: https://tsch.js.org/106
+*/
+
+/* _____________ Your Code Here _____________ */
+
+type TrimLeft<S extends string> = S extends `${infer A}${infer B}`
+  ? A extends " " | "\n" | "\t"
+    ? TrimLeft<B>
+    : S
+  : S;
+type trimed = TrimLeft<"  Hello World  ">; // expected to be 'Hello World  '
+
+/* _____________ Test Cases _____________ */
+import type { Equal, Expect } from "@type-challenges/utils";
+
+type cases = [
+  Expect<Equal<TrimLeft<"str">, "str">>,
+  Expect<Equal<TrimLeft<" str">, "str">>,
+  Expect<Equal<TrimLeft<"     str">, "str">>,
+  Expect<Equal<TrimLeft<"     str     ">, "str     ">>,
+  Expect<Equal<TrimLeft<"   \n\t foo bar ">, "foo bar ">>,
+  Expect<Equal<TrimLeft<"">, "">>,
+  Expect<Equal<TrimLeft<" \n\t">, "">>
+];
+
+/* _____________ Further Steps _____________ */
+/*
+  > Share your solutions: https://tsch.js.org/106/answer
+  > View solutions: https://tsch.js.org/106/solutions
+  > More Challenges: https://tsch.js.org
+*/

Languages/Typescript/Generics/00108-medium-trim.ts

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+/*
+  108 - Trim
+  -------
+  by Anthony Fu (@antfu) #medium #template-literal
+
+  ### Question
+
+  Implement `Trim<T>` which takes an exact string type and returns a new string with the whitespace from both ends removed.
+
+  For example
+
+  ```ts
+  type trimmed = Trim<'  Hello World  '> // expected to be 'Hello World'
+  ```
+
+  > View on GitHub: https://tsch.js.org/108
+*/
+
+/* _____________ Your Code Here _____________ */
+type WhiteSpace = " " | "\n" | "\t" | "\r";
+
+type TrimLeft<S extends string> = S extends `${infer A}${infer B}`
+  ? A extends WhiteSpace
+    ? TrimLeft<B>
+    : S
+  : S;
+
+
+type TrimRight<S extends string> = S extends `${infer B}${WhiteSpace}`
+  ? TrimRight<B>
+  : S;
+
+type Trim<S extends string> = TrimLeft<TrimRight<S>>;
+
+/* _____________ Test Cases _____________ */
+import type { Equal, Expect } from "@type-challenges/utils";
+
+type cases = [
+  Expect<Equal<Trim<"str">, "str">>,
+  Expect<Equal<Trim<" str">, "str">>,
+  Expect<Equal<Trim<"     str">, "str">>,
+  Expect<Equal<Trim<"str   ">, "str">>,
+  Expect<Equal<Trim<"     str     ">, "str">>,
+  Expect<Equal<Trim<"   \n\t foo bar \t">, "foo bar">>,
+  Expect<Equal<Trim<"">, "">>,
+  Expect<Equal<Trim<" \n\t ">, "">>
+];
+
+/* _____________ Further Steps _____________ */
+/*
+  > Share your solutions: https://tsch.js.org/108/answer
+  > View solutions: https://tsch.js.org/108/solutions
+  > More Challenges: https://tsch.js.org
+*/