Generators

Generators use real PHP Fibers — lightweight threads under the hood.

§ evens(n) ⟦
    # i = 0 .. n ⟦
        ? even(i) ⟦ ↤ i ⟧
    ⟧
⟧

⇶ x = evens(10) ⟦
    » "even:", x
⟧

Output:

even: 0
even: 2
even: 4
even: 6
even: 8

Infinite generator

§ counter() ⟦
    ¤ i = 0
    @ ☑ ⟦
        ↤ i
        i = i + 1
    ⟧
⟧