(Calling Functions): Wording fixes from RMS.

This commit is contained in:
Eli Zaretskii
2008-10-20 10:22:16 +00:00
parent 712adc825a
commit a18a6d497c

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@@ -727,7 +727,7 @@ of mapcar}.
@cindex partial application of functions
@cindex currying
Sometimes, it is useful to fix some of the function's arguments at
Sometimes it is useful to fix some of the function's arguments at
certain values, and leave the rest of arguments for when the function
is actually called. The act of fixing some of the function's
arguments is called @dfn{partial application} of the function@footnote{
@@ -737,7 +737,9 @@ it can be called as a chain of functions, each one with a single
argument.}.
The result is a new function that accepts the rest of
arguments and calls the original function with all the arguments
combined. Emacs provides a function for partial evaluation:
combined.
Here's how to do partial application in Emacs Lisp:
@defun apply-partially func &rest args
This function returns a new function which, when called, will call
@@ -747,14 +749,14 @@ accepts @var{n} arguments, then a call to @code{apply-partially} with
@w{@code{@var{m} < @var{n}}} arguments will produce a new function of
@w{@code{@var{n} - @var{m}}} arguments.
Here's an example of using @code{apply-partially} to produce a
function @code{incr}, that will increment its argument by one, based
on the Emacs Lisp primitive @code{+}:
Here's an example of using @code{apply-partially} to produce a variant
of the Emacs Lisp primitive @code{1+}, a function that increments its
argument by one, based on the primitive @code{+}:
@example
(fset 'incr (apply-partially '+ 1))
(fset 'incr-by-one (apply-partially '+ 1))
@group
(incr 10)
(incr-by-one 10)
@result{} 11
@end group
@end example