Node:let-keywords Reference, Next:lambda* Reference, Previous:let-optional Reference, Up:Optional Arguments
let-keywords and let-keywords* are used for extracting
values from argument lists which use keywords instead of argument
position for binding local variables to argument values.
let-keywords binds all variables simultaneously, while
let-keywords* binds them sequentially, consistent with let
and let* (see Local Bindings).
| let-keywords rest-arg allow-other-keys? (binding ...) expr ... | library syntax |
| let-keywords rest-arg allow-other-keys? (binding ...) expr ... | library syntax |
These macros pick out keyword arguments from rest-arg, but do not
modify it. This is consistent at least with Common Lisp, which
duplicates keyword arguments in the rest argument. More explanation of what
keyword arguments in a lambda list look like can be found below in
the documentation for lambda*
(see lambda* Reference). bindings can have the same form as
for let-optional. If allow-other-keys? is false, an error
will be thrown if anything that looks like a keyword argument but does
not match a known keyword parameter will result in an error.
After binding the variables, the expressions expr ... are evaluated in order. |