Function map1

map1<TToken, TOptions, TValue1, TValue2>(p: Parser<TToken, TOptions, TValue1>, mapper: ((m: Match<TValue1>, data: Data<TToken, TOptions>, i: number) => Result<TValue2>)): Parser<TToken, TOptions, TValue2>
Make a new parser that transforms the match from a given parser.

This version can discard a Match - return a NonMatch instead.

Note: pay attention to the return type and indices.

Use map if mapping exists for all matched values.
Type Parameters
- TToken
- TOptions
- TValue1
- TValue2
Parameters
- p: Parser<TToken, TOptions, TValue1>
  
  A base parser.
- mapper: ((m: Match<TValue1>, data: Data<TToken, TOptions>, i: number) => Result<TValue2>)
  
  A function that modifies the match.
  - - (m: Match<TValue1>, data: Data<TToken, TOptions>, i: number): Result<TValue2>
    - Returns
      A transformed Result object - either Match or NonMatch.
      
      Parameters
      
      m: Match<TValue1>
      
      A Match object from the base parser (contains the value and the position after the match).
      
      data: Data<TToken, TOptions>
      
      Data object (tokens and options).
      
      i: number
      
      Parser position in the tokens array (before the first parser matched).
      
      Returns Result<TValue2>
Returns Parser<TToken, TOptions, TValue2>

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