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| author | YugaEgo <yet@ego.team> | 2021-11-30 14:03:32 +0100 |
|---|---|---|
| committer | Lars Ingebrigtsen <larsi@gnus.org> | 2021-11-30 14:04:22 +0100 |
| commit | cd9dd26d24c0e97b980fba44c2f8f9e1d6c919a5 (patch) | |
| tree | 1bdf8dbfc826fc93e148e6a32be6453957df24f3 /doc/lispintro | |
| parent | ab291656d0e66ebaf763a7b527bc043f84a9ae78 (diff) | |
| download | emacs-cd9dd26d24c0e97b980fba44c2f8f9e1d6c919a5.tar.gz | |
Format and index concept 'predicate' in ELisp Intro
* doc/lispintro/emacs-lisp-intro.texi (Wrong Type of Argument):
Add index and format definition (bug#52197).
Copyright-paperwork-exempt: yes
Diffstat (limited to 'doc/lispintro')
| -rw-r--r-- | doc/lispintro/emacs-lisp-intro.texi | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/lispintro/emacs-lisp-intro.texi b/doc/lispintro/emacs-lisp-intro.texi index e3064580580..bd5decff669 100644 --- a/doc/lispintro/emacs-lisp-intro.texi +++ b/doc/lispintro/emacs-lisp-intro.texi @@ -2146,9 +2146,10 @@ number---the number of characters the location is from the beginning of the buffer.) In Emacs Lisp, @code{+} can be used to add the numeric value of marker positions as numbers. +@cindex @samp{predicate} defined The @samp{p} of @code{number-or-marker-p} is the embodiment of a practice started in the early days of Lisp programming. The @samp{p} -stands for ``predicate''. In the jargon used by the early Lisp +stands for @dfn{predicate}. In the jargon used by the early Lisp researchers, a predicate refers to a function to determine whether some property is true or false. So the @samp{p} tells us that @code{number-or-marker-p} is the name of a function that determines |