(setq SYM EXPR)Bind the symbol SYM to the value of EXPR. SYM must be
an unqualified symbol, i.e. not quoted, and literal: (setq "foo"
bar) will not work. Likewise (setq (bar STUFF) foo) will also
not work, even if (bar …) would evaluate to an unqualified
symbol: varible names must be literals. Note that calling (setq
SYM …) will alter the value of SYM within the current
name-space: if SYM, e.g., is bound as local variable by a lambda,
let or defun expression, then (setq SYM …) will change the
value of the local variable, the global binding will remain unchanged.
It is NOT possible to un-bind a symbol. However, subsequent (setq
SYM …) invocations will re-bind SYM to another value and free
the lisp-object previously bound to SYM.
See (lambda …).
See (defun …).
See (let …).