Difference between revisions of "Thunks and Streams Assignment"

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define a function <code>next-value-from-stream</code> which takes a stream parameter and returns the next value of that stream.
 
define a function <code>next-value-from-stream</code> which takes a stream parameter and returns the next value of that stream.
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define a function <code>next-stream-from-stream</code> which takes a stream parameter and returns the next stream of that stream.
  
 
define a function <code>stream-cons</code> which takes two parameters <code>value</code> and <code>stream-prime</code>.  if the specified <code>stream-prime</code> parameter is not a stream then an error should be raised:
 
define a function <code>stream-cons</code> which takes two parameters <code>value</code> and <code>stream-prime</code>.  if the specified <code>stream-prime</code> parameter is not a stream then an error should be raised:

Revision as of 07:11, 2 July 2019

Thunk Utilities

define a function thunk? which returns #t if the specified parameter is a thunk, #f otherwise.

define a macro thunk which creates thunk

define a function dethunk which takes a thunk parameter th and returns the result of invoking th.

Stream Utilities

define a function stream? which returns #t if the specified parameter is a stream, #f otherwise.

define a function next-value-from-stream which takes a stream parameter and returns the next value of that stream.

define a function next-stream-from-stream which takes a stream parameter and returns the next stream of that stream.

define a function stream-cons which takes two parameters value and stream-prime. if the specified stream-prime parameter is not a stream then an error should be raised:

(raise (error "not a stream" stream-prime))

Stream App

define flip-flop-stream which produces #t #f #t #f #t #f #t #f...