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lambda(n) Utility commands for anonymous procedures lambda(n) 





NAME


lambda - Utility commands for anonymous procedures






SYNOPSIS


package require Tcl 8.5


package require lambda ?1?


::lambda arguments body ?arg...?


::lambda@ namespace arguments body
    ?arg...?










DESCRIPTION


This package provides two convenience commands to make the writing
    of anonymous procedures, i.e. lambdas more proc-like. Instead of, for
    example, to write






     set f {::apply {{x} {


        ....


     }}}




with its deep nesting of braces, or





     set f [list ::apply {{x y} {


        ....


     }} $value_for_x]




with a list command to insert some of the arguments of a partial application,
  just write





     set f [lambda {x} {


        ....


     }]




and





     set f [lambda {x y} {


        ....


     } $value_for_x]









COMMANDS



  
::lambda arguments body ?arg...?

  
The command constructs an anonymous procedure from the list of arguments,
      body script and (optional) predefined argument values and returns a
      command prefix representing this anonymous procedure.
    
When invoked the body is run in a new procedure scope
        just underneath the global scope, with the arguments set to the values
        supplied at both construction and invokation time.

  

  
::lambda@ namespace arguments body
    ?arg...?

  
The command constructs an anonymous procedure from the namespace name,
      list of arguments, body script and (optional) predefined argument values
      and returns a command prefix representing this anonymous procedure.
    
When invoked the body is run in a new procedure scope
        in the namespace, with the arguments set to the values supplied
        at both construction and invokation time.

  








AUTHORS


Andreas Kupries






BUGS, IDEAS, FEEDBACK


This document, and the package it describes, will undoubtedly
    contain bugs and other problems. Please report such in the category
    lambda of the Tcllib Trackers
    [http://core.tcl.tk/tcllib/reportlist]. Please also report any ideas for
    enhancements you may have for either package and/or documentation.


When proposing code changes, please provide unified diffs,
    i.e the output of diff -u.


Note further that attachments are strongly preferred over
    inlined patches. Attachments can be made by going to the Edit form of
    the ticket immediately after its creation, and then using the left-most
    button in the secondary navigation bar.






SEE ALSO


apply(n), proc(n)






KEYWORDS


anonymous procedure, callback, command prefix, currying, lambda,
    partial application, proc






CATEGORY


Utility






COPYRIGHT


Copyright (c) 2011 Andreas Kupries, BSD licensed








  

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