Attributes

Source

github.com/denful/bend

attr "k"

Focus on key k. right when present; left s when missing.

(bend.attr "x").get { x = 1; }   # right 1
(bend.attr "x").get { }           # left { }

attrOr "k" default

Focus on key k with fallback. Always right.

(bend.attrOr "port" 8080).get { }           # right 8080
(bend.attrOr "port" 8080).get { port = 3; } # right 3

path [keys]

Chain of attr for nested access.

(bend.path ["a" "b"]).get { a = { b = 42; }; }   # right 42

eachValue lens

Apply lens to every value in an attrset.

mapKey f

Rename attrset keys with function f.