Disclosure
Most of the problems under my TypeHero Challenges folder were either obtained from typehero.dev or from type-challenges repo. Purpose of these articles are just to document my approaches for my easy reference. Please visit the respective links for more info.
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Problem Description
Implement TrimLeft<T> which takes an exact string type and returns a new string with the whitespace beginning removed.
For example:
type trimed = TrimLeft<' Hello World '> // expected to be 'Hello World 'Solutions
Approach: Using infer
type Whitespace = ' ' | '\t' | '\n';
type TrimLeft<S extends string> = S extends `${Whitespace}${infer Rest}`
? TrimLeft<Rest>
: S;