special unique value to signify a key was not present (vs set to nil)
special unique value to signify a key was not present (vs set to nil)
(absent? x)
return true if x was absent. use with get and get-in
return true if x was absent. use with get and get-in
(deref-and-validate ctx-atm)
throw if the menu is malformed. otherwise return the current choices and path.
throw if the menu is malformed. otherwise return the current choices and path.
(keys-in m)
returns the paths to all the leaf node keys in map m. https://stackoverflow.com/a/21769786 -- thank you Alex.
returns the paths to all the leaf node keys in map m. https://stackoverflow.com/a/21769786 -- thank you Alex.
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