for*

for* is the sequential counterpart to for.

Syntax

(for (⟨binding-clause⟩...)
  [:returns ⟨expr⟩]
  [{:while | :until | :repeat} ⟨expr⟩]
  ⟨body⟩...)

;; ⟨binding-clause⟩ := (⟨var⟩ ⟨init-expr⟩ ⟨step-expr⟩)

Semantics

• Initializers follow let*-style top-to-bottom scoping.
• Step expressions are also performed top to bottom.
• Use for* when later loop state should depend on earlier updated values.
• :while loops while the condition is true.
• :until loops until the condition is true.
• :repeat loops a certain fixed number of times.
• :returns specifies what to return when the loop exits, either normally or by (break).
• No :returns means the loop unifies with Void.
• Use for* when later steps should see earlier updated values.

Example

(for* ((x 1 (+ x y))
       (y 1 x))
  :until (> x 10)
  (show x))