4.2.3 Sequencing

library syntax: begin <expression1> <expression2> …,

The <expression>s are evaluated sequentially from left to right, and the value(s) of the last <expression> is(are) returned. This expression type is used to sequence side effects such as input and output.

(define x 0)

(begin (set! x 5)
       (+ x 1))                        ⇒  6

(begin (display "4 plus 1 equals ")
       (display (+ 4 1)))              ⇒  unspecified
          and prints  4 plus 1 equals 5

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