5.92
5 Exploring Types
In addition to printing a summary of the types of REPL results, Typed Racket
provides interactive utilities to explore and query types.
The following bindings are only available at the Typed Racket REPL.
(:type maybe-verbose t)
|
| |
| maybe-verbose | | = | | | | | | | | | #:verbose |
|
Prints the type
t. If
t is a type alias
(e.g.,
Number), then it will be expanded to its representation
when printing. Any further type aliases in the type named by
t
will remain unexpanded.
If #:verbose is provided, all type aliases are expanded
in the printed type.
Examples: |
| > (:type Number) | (U Inexact-Complex Exact-Number Real Float-Imaginary Single-Flonum-Imaginary) | [can expand further: Inexact-Complex Exact-Number Real] |
| | | > (:type Real) | (U Negative-Real Nonnegative-Real) | [can expand further: Negative-Real Nonnegative-Real] |
| | | > (:type #:verbose Number) | (U 0 1 Byte-Larger-Than-One Positive-Index-Not-Byte Positive-Fixnum-Not-Index Negative-Fixnum Positive-Integer-Not-Fixnum Negative-Integer-Not-Fixnum Positive-Rational-Not-Integer Negative-Rational-Not-Integer Float-Nan Float-Positive-Zero Float-Negative-Zero Positive-Float-No-NaN Negative-Float-No-NaN Single-Flonum-Nan Single-Flonum-Positive-Zero Single-Flonum-Negative-Zero Positive-Single-Flonum-No-Nan Negative-Single-Flonum-No-Nan Exact-Imaginary Exact-Complex Float-Imaginary Single-Flonum-Imaginary Float-Complex Single-Flonum-Complex) | |
|
Prints the type of e. This prints the whole
type, which can sometimes be quite large.
Given a function f and argument
types t, shows the result type of f.
Given a function f and a desired
return type t, shows the arguments types f should be given to
return a value of type t.