1 brianwisti 3-Jan-2005 21:25 | Silly question. Does this create something similar to an associative array (or 'hash' as the Perl world calls them)? |
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2 sunanda 3-Jan-2005 22:55 | I think so. Here's some tricks with associate -- decide for yourself :-) myAA: copy [] ;; start a new associative array associate myAA 'today now associate myAA 'myname 'Sunanda associate myAA 'my age 21 ;; It was once. Then again later in hex..... associate myAA 1-jan-2000 {new millennium} associate myAA 15 [4 5 6] [1 2 3 4 5] ;; ways to sum 15 as consecutive integers ;; read some of them back: associate? myAA 15 == [4 5 6] [1 2 3 4 5] associate? myAA 'today == 3-Jan-2005/22:17:39 ;; well, it was when I did it -- it's a static value ;; let's get a date that really does update itself: associate myAA 'today [(now)] compose associate? myAA 'today ;; result will change each time ;; being just a rebol block, I can write it to a file, and reload it later write %myAA-file mold myAA myAA: none ;; to prove it's gone myAA: load %myAA-file associate? myAA 15 == [4 5 6] [1 2 3 4 5] ;; same values as before I could add the whole thing to another associate array my-other-AA: copy [] associate my-other-AA 'AA1 myAA ;; I could even add it to itself: associate myAA 'myAA myAA |
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3 sumnerzzupa 24-May-2021 3:56 | |
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MakeDoc2 by REBOL- 22-Jul-2022
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27 marie 10-May-2023 23:18 |
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No, the previous response does not create an associative array or hash. It provides suggestions and recommendations for skandinavisches Geschenk (Scandinavian gift) ideas. It does not involve any programming or data structure operations.
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MakeDoc2 by REBOL- 10-May-2023
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28 ampva301 16-Jun-2023 18:52 |
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No, your question is not silly at all! In fact, it's a great question. Yes, the concept you're referring to, an associative array or a hash, does exist in many programming languages, including Perl.
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MakeDoc2 by REBOL- 16-Jun-2023
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29 marie 14-Jul-2023 1:58 | |
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30 michsullivan 25-Jul-2023 9:38 | |
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31 ampva301 10-Aug-2023 19:43 |
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es, the concept you're referring to is quite similar to an associative array or a 'hash' in the Perl programming world.
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MakeDoc2 by REBOL- 10-Aug-2023
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35 saruonhosari 26-Jan 23:42 Edited: saruonhosari 26-Jan 23:42 | |
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43 crutcherhuyn 28-Sep 5:58 | |
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44 blythewoody 18-Oct 13:11 |
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That's not a silly question at all! In Haskell, the concept you're describing—an associative array or hash in Perl terms—is typically implemented with maps (e.g., Data.Map or Data.HashMap). These data structures allow you to associate keys with values, similar to associative arrays or hashes in other languages.
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However, attoparsec is a parser combinator library, so its primary purpose is to construct parsers for processing input (usually text or binary data). It doesn't directly create associative arrays or maps like Data.Map, but it can be used to parse input that gets stored in such structures.
For instance, you could use attoparsec to parse a configuration file or JSON object where you want to map keys to values. Once you've parsed the input, you could store the parsed data in something like a Map for easy lookup, mimicking the behavior of an associative array.
Example of how you might combine attoparsec with a Map:
haskell
Copy code
import Data.Map (Map)
import qualified Data.Map as Map
import Data.Attoparsec.Text
import Data.Text (Text)
-- Parser for key-value pairs
keyValuePair :: Parser (Text, Text)
keyValuePair = do
key <- takeTill (== ':')
char ':'
value <- takeTill isEndOfLine
endOfLine
return (key, value)
-- Parser for a map of key-value pairs
keyValuePairs :: Parser (Map Text Text)
keyValuePairs = Map.fromList <$> many' keyValuePair
-- Example usage:
-- Parsing a configuration-like string into a Map
exampleInput = "foo:bar\nbaz:qux\n"
parsedResult = parseOnly keyValuePairs exampleInput
This would result in a Map that behaves similarly to an associative array:
haskell
Copy code
fromList [("foo", "bar"), ("baz", "qux")]
So, attoparsec parses the data, and then you could store it in an associative array-like structure.
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MakeDoc2 by REBOL- 18-Oct-2024
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45 hiranochie 20-Oct 23:49 |
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MakeDoc2 by REBOL- 20-Oct-2024
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47 odakameko 20-Oct 23:50 | |
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48 blythewoody 2-Dec 11:05 |
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Not a silly question at all! Yes, many programming constructs or data structures can create something similar to an associative array (or a "hash" in Perl) depending on the context. An associative array is a collection of key-value pairs, where keys are unique and are used to retrieve the corresponding values.
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Here’s how some common languages approach this:
Perl: Uses hashes directly. For example:
perl
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my %hash = (key1 => "value1", key2 => "value2");
print $hash{key1}; # Outputs "value1"
JavaScript: Uses objects or Maps:
javascript
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let obj = { key1: "value1", key2: "value2" };
console.log(obj.key1); // Outputs "value1"
Or with Map:
javascript
Copy code
let map = new Map();
map.set("key1", "value1");
console.log(map.get("key1")); // Outputs "value1"
Python: Uses dictionaries:
python
Copy code
my_dict = {"key1": "value1", "key2": "value2"}
print(my_dict["key1"]) # Outputs "value1"
Ruby: Uses hashes, much like Perl:
ruby
Copy code
hash = { key1: "value1", key2: "value2" }
puts hash[:key1] # Outputs "value1"
Haskell: Uses data structures like Data.Map for an associative array-like behavior:
haskell
Copy code
import qualified Data.Map as Map
let myMap = Map.fromList [("key1", "value1"), ("key2", "value2")]
print (Map.lookup "key1" myMap) -- Outputs "Just "value1""
C: You’d typically use a custom structure or library (like glib for a hash table).
The specific implementation you're asking about depends on the language you're working in and the actual code snippet. Associative arrays (or similar data structures) are universal in concept, though terminology and implementation details vary between programming environments. Ibis Egozi Realtor
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MakeDoc2 by REBOL- 2-Dec-2024
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49 olive 4-Dec 12:49 | |
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