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lambda(3tcl)                Utility commands for anonymous procedures                lambda(3tcl)

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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...?

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DESCRIPTION
       This package provides two convenience commands to make the writing of anonymous proce‐
       dures, 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 rep‐
              resenting 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 com‐
              mand 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 prob‐
       lems.  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.

SEE ALSO
       apply(3tcl), proc(3tcl)

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

CATEGORY
       Utility

COPYRIGHT
       Copyright (c) 2011 Andreas Kupries, BSD licensed

tcllib                                          1                                    lambda(3tcl)