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

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

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

Examples:

          (string-ec              ;no qualifiers
            #\a)
          ⇒ (string #\a)
          
          (string-ec (:range i 0)
            #\a)
          ⇒ ""
          
          (string-ec (:range i 1)
            #\a)
          ⇒ "a"
          
          (string-ec (:range i 2)
            #\a)
          ⇒ "aa"

— Syntax: string-append-ec ?qualifier ... expression

The string obtained by appending all values of expression, which must all be strings. Think of it as:

          (apply string-append (list-ec ?qualifier ... expression))

Examples:

          (string-append-ec
            "ab")
          ⇒ "ab"
          
          (string-append-ec (:range i 0)
            "ab")
          ⇒ ""
          
          (string-append-ec (:range i 1)
            "ab")
          ⇒ "ab"
          
          (string-append-ec (:range i 2)
            "ab")
          ⇒ "abab"