— Syntax: vector-ec ?qualifier ... expression

The vector of all values of expression. Think of it as:

          (list->vector (list-ec ?qualifier ... expression))

Examples:

          (vector-ec              ;no qualifiers
            1)
          ⇒ (vector 1)
          
          (vector-ec (:range i 0)
            i)
          ⇒ (vector)
          
          (vector-ec (:range i 1)
            i)
          ⇒ (vector 0)
          
          (vector-ec (:range i 2)
            i)
          ⇒ (vector 0 1)

— Syntax: vector-of-length-ec k ?qualifier ... expression

The vector of all values of expression, of which there must be exactly k. This comprehension behaves like vector-ec but can be implemented more efficiently.

          (vector-of-length-ec 1
            1)
          ⇒ (vector 1)
          
          (vector-of-length-ec 0 (:range i 0)
            i)
          ⇒ (vector)
          
          (vector-of-length-ec 1 (:range i 1)
            i)
          ⇒ (vector 0)
          
          (vector-of-length-ec 2 (:range i 2)
            i)
          ⇒ (vector 0 1)