• Racket
  • language type
  • data type
    • string
    • boolean
  • variable
    • function (procedure)
  • special form

Racket

language type

specify the language used in the first line of a program

#lang racket

data type

string

string literal can have new line

boolean

#t #f

• non-#f are considered #t

variable

(define var_name expression)

function (procedure)

(define (func_name args) (output))

call function

(func_name args)

special form

(if test1 do_if_true do_if_false)

(cond (test1 do_if_test1)
      (test2 do_if_test2)
      (else fallback_expr))

(begin first_thing_to_do second_to_do)