skip to content W3C SVG

branching helpers

conditional convenience macros

Usage: (case expr [test branch]*) (if-let [name expr] then else?) (when-let [name expr] form*)

These macros build on if to cover common control-flow patterns. case compares a value using eq, and a clause test may be either a single value or a list of values. if-let binds a value and tests whether it is truthy. when-let is the body-only form of if-let. If no case clause matches, it raises an error.

An Example

(if-let [x (get {:name "ale"} :title false)]
  (str "hello " x)
  "missing")