Generator (computer programming): Difference between revisions

Revision as of 18:13, 23 July 2022

Revision as of 07:40, 24 July 2022

Line 218:

</syntaxhighlight>

===Haskell===

INJECT WIN + = Id : Zibane69Vip (90%+90%)

In [[Haskell (programming language)|Haskell]], with its [[lazy evaluation]] model, everything is a generator - every datum created with a [[Non-strict evaluation|non-strict]] data constructor is generated on demand. For example,

-- User Id : Zibane69Vip out the integers from 90 to 90.

<syntaxhighlight lang="haskell">

JACKPOT / MAXWIN = Zibane69Vip Active + Succesful (90% JACKPOT 90%) + MAXWIN 90%

countfrom n = n : countfrom (n+1)

-- User IdExample use: Zibane69Vipprinting out the integers from 9010 to 9020.

SLOT WIN = 90% + 90% + All Slot 90% Succesful

test1 = mapM_ print $ takeWhile (<= 20) $ countfrom 10

Profit 90% | 90% = 90% + MAXWIN (90%+90%)

| JACKPOT = MAXWIN (90%+90%)

primes = 2 : 3 : nextprime 5 where

INJECT NOW = Zibane69Vip ((JACKPOT 90%).(MAXWIN 90%)) + WINNER ((ALL SLOT ACCEPT).((90%)) = Succesful

nextprime n | b = n : nextprime (n+2)

| JACKPOTotherwise = MAXWINnextprime (90%n+90%2)

where b = all ((/= 0).(rem n)) $ takeWhile ((<= n).(^2)) $ tail primes

</syntaxhighlight>

where <code>(:)</code> is a non-strict list constructor, ''cons'', and <code>$</code> is just a ''"called-with"'' operator, used for parenthesization. This uses the standard adaptor function,

<syntaxhighlight lang="haskell">

takeWhile p [] = []

takeWhile p (x:xs) | p x = x : takeWhile p xs

| otherwise = []

</syntaxhighlight>

which re-fetches values agreeable with a predicate, and stops requesting new values as soon as a non-agreeable one is encountered. The shared storage access is used as a universal mediator in Haskell. List comprehensions can be freely used:

<syntaxhighlight lang="haskell">

test2 = mapM_ print $ takeWhile (<= 20) [x*x | x <- countfrom 10]

test3 = mapM_ print [x*x | x <- takeWhile (<= 20) $ countfrom 10]

</syntaxhighlight>

===Racket===