Re: Injecting names & method chaining (was Re: [ANN] Penlight Libraries, First release)

[Mark Hamburg <mark@...>]

On May 1, 2009, at 8:42 PM, David Manura wrote:

>  f = chain(stringx):trim():repeatchars(5):upper()

This potentially leads to:

	f = chain( string, stringx ):trim():repeatchars(5):upper()

thereby eliminating the need for adding the methods from string to  
stringx.

On a potentially related note, I had previously been thinking about  
ways to do chaining/pipelining for iterator construction. As I recall,  
that had lead to constructs like:

	pipe( pairs, map( function( k, v ) return tostring( k ),  
tostring( v ) end ), filter( function( k, v ) return #k == 3 end ) ) ) 
( t )

Those had never felt as clean as one might like, however, though they  
did encourage saving the pipe for reuse. Perhaps there's something to  
be explored in your chain solution.

Mark

P.S. The obj:[ method ] syntax suggestion actually arose out of  
wanting to make it easier to call variable methods without expanding  
the colon operator and thereby muddying the waters about the intent of  
the code.