How to Design Programs Languages

1`` | Beginning Student
2`` | Beginning Student with List Abbreviations
3`` | Intermediate Student
4`` | Intermediate Student with Lambda
5`` | Advanced Student
| Index

On this page:

local
letrec
let*
cond
else
if
and
or
time
check-expect
check-within
check-error
empty
true
false
require

Version: 4.0.2
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#### 5.14`` Unchanged Forms

(local [definition ...] expr)

(letrec ([id expr-for-let] ...) expr)

(let* ([id expr-for-let] ...) expr)

The same as Intermediate’s local, letrec, and let*.

(cond [expr expr] ... [expr expr])

else

The same as Beginning’s cond, except that else can be used with case.

(if expr expr expr)

The same as Beginning’s if.

(and expr expr expr ...)

(or expr expr expr ...)

The same as Beginning’s and and or.

(time expr)

The same as Intermediate’s time.

(check-expect expr expr)

(check-within expr expr expr)

(check-error expr expr)

The same as Beginning’s check-expect, etc.

empty : empty?

true : boolean?

false : boolean?

Constants for the empty list, true, and false.

(require string)

The same as Beginning’s require.

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