Function left

left<TToken, TOptions, TValueA, TValueB>(pa: Matcher<TToken, TOptions, TValueA>, pb: Matcher<TToken, TOptions, TValueB>): Matcher<TToken, TOptions, TValueA>
This overload makes a Matcher that applies two matchers one after another and returns the result from the first one.

Implementation is based on ab.
Type Parameters
- TToken
- TOptions
- TValueA
- TValueB
Parameters
- pa: Matcher<TToken, TOptions, TValueA>
  
  First matcher (result is returned).
- pb: Matcher<TToken, TOptions, TValueB>
  
  Second matcher (result is discarded).
Returns Matcher<TToken, TOptions, TValueA>
left<TToken, TOptions, TValueA, TValueB>(pa: Parser<TToken, TOptions, TValueA>, pb: Parser<TToken, TOptions, TValueB>): Parser<TToken, TOptions, TValueA>
Make a parser that tries two parsers one after another and returns the result from the first one if both matched.

A nonmatch is returned if any of two parsers did not match.

Implementation is based on ab.
Type Parameters
- TToken
- TOptions
- TValueA
- TValueB
Parameters
- pa: Parser<TToken, TOptions, TValueA>
  
  First parser (result is returned).
- pb: Parser<TToken, TOptions, TValueB>
  
  Second parser (result is discarded).
Returns Parser<TToken, TOptions, TValueA>

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