compile/each

Syntax: (each [BINDING SEQ] BODY ...), with an optional when: or unless: clause on the header.

Behaviour: A generator that yields the value of BODY for each element of SEQ bound as BINDING, built from a for-each and a yield inside a function. The filter clause skips elements whose test fails. The binding destructures like a for-each binding, so [[x y] pairs] takes two names per element. The generator is lazy and iterates from both sync and async consumers.

Examples:

var squares:
  each [x (range 6)]:
    (* x x)

(list squares)                  ;; [0, 1, 4, 9, 16, 25]

(list (each [x (range 10)] when: (== 0 (% x 2)) x))
;; [0, 2, 4, 6, 8]

each [[x y] (product (range 3) (range 3))]:
  #(x y)

See also: list-each, dict-each, for-each.