Function optional

optional<A, CTX, PROBLEM>(parser: Parser.Parser<A, CTX, PROBLEM>): Parser.Parser<undefined | A, CTX, PROBLEM>
Just like Simple.optional
Type Parameters
- A
- CTX
- PROBLEM
Parameters
- parser: Parser.Parser<A, CTX, PROBLEM>
Returns Parser.Parser<undefined | A, CTX, PROBLEM>
- Defined in Advanced.ts:1390