Elisp: Symbol Property List
What is Symbol Property List
Each lisp Symbol is associated with a Property List .
This property list is stored in the symbol's property list cell.
Symbol Property List is used extensively in emacs. It is also very useful if you want to write a function with state. You can store the state info with the symbol itself, instead of using a global variable.
Get Whole Plist
symbol-plist-
(symbol-plist SYMBOL)
Return SYMBOL's property list.
Set Whole Plist
setplist-
(setplist SYMBOL NEWPLIST)
Set SYMBOL's property list to NEWPLIST, and return NEWPLIST.(setplist 'ff '(a 1 b 2))
Get a Key's Value
get-
(get SYMBOL PROPNAME)
Return the value of SYMBOL's PROPNAME property.;; get the value of key xx, of symbol ff's property list (get 'ff 'xx)
Add or Set a Key
put-
(put SYMBOL PROPNAME VALUE)
Store SYMBOL's PROPNAME property with value VALUE.;; set the value of key xx, of symbol ff's property list (put 'ff 'xx 5)