Add truncatef
| author |
Steve Losh <steve@stevelosh.com> |
| date |
Thu, 22 Oct 2020 21:42:10 -0400 |
| parents |
861b0bbcb319 |
| children |
04ad2212b90f |
(in-package :losh.hash-tables)
(defun mutate-hash-values (function hash-table)
"Replace each value in `hash-table` with the result of calling `function` on it.
Returns the hash table.
"
(iterate (for (key value) :in-hashtable hash-table)
(setf (gethash key hash-table)
(funcall function value)))
hash-table)
(defun hash-table-contents (hash-table)
"Return a fresh list of `(key value)` elements of `hash-table`."
(gathering (maphash (compose #'gather #'list) hash-table)))
(defun remhash-if (test hash-table)
"Remove elements which satisfy `(test key value)` from `hash-table`.
Returns the hash table."
(maphash (lambda (k v)
(when (funcall test k v)
(remhash k hash-table)))
hash-table)
hash-table)
(defun remhash-if-not (test hash-table)
"Remove elements which don't satisfy `(test key value)` from `hash-table`.
Returns the hash table."
(maphash (lambda (k v)
(unless (funcall test k v)
(remhash k hash-table)))
hash-table)
hash-table)
(defun remhash-if-key (test hash-table)
"Remove elements which satisfy `(test key)` from `hash-table`.
Returns the hash table."
(maphash (lambda (k v)
(declare (ignore v))
(when (funcall test k)
(remhash k hash-table)))
hash-table)
hash-table)
(defun remhash-if-not-key (test hash-table)
"Remove elements which satisfy don't `(test key)` from `hash-table`.
Returns the hash table."
(maphash (lambda (k v)
(declare (ignore v))
(unless (funcall test k)
(remhash k hash-table)))
hash-table)
hash-table)
(defun remhash-if-value (test hash-table)
"Remove elements which satisfy `(test value)` from `hash-table`.
Returns the hash table."
(maphash (lambda (k v)
(when (funcall test v)
(remhash k hash-table)))
hash-table)
hash-table)
(defun remhash-if-not-value (test hash-table)
"Remove elements which satisfy don't `(test value)` from `hash-table`.
Returns the hash table."
(maphash (lambda (k v)
(unless (funcall test v)
(remhash k hash-table)))
hash-table)
hash-table)