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Associative array/Iteration: Difference between revisions

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Associative array/Iteration (view source)

Revision as of 08:07, 24 January 2024

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→‎{{header|UNIX Shell}}: mention bash
m (BaCon, BASIC256, and BBC BASIC moved to the BASIC section.)
 
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=={{header|EasyLang}}==
<syntaxhighlight lang="easylang">
# use array of array for this
associative$[][] = [ [ 1 "associative" ] [ 2 "arrays" ] ]
clothing$[][] = [ [ "type" "t-shirt" ] [ "color" "red" ] [ "size" "xl" ] ]
print "Key-value pairs:"
for i = 1 to len associativeclothing$[][]
print associativeclothing$[i][1] & ": " & associativeclothing$[i][2]
.</syntaxhighlight>
.
print "Just keys:"
for i = 1 to len associative$[][]
print associative$[i][1]
.
print "Just values:"
for i = 1 to len associative$[][]
print associative$[i][2]
.
</syntaxhighlight>
{{out}}
<pre>
Key-value pairs:
1 associative
2 arrays
Just keys:
1
2
Just values:
associative
arrays
</pre>
 
=={{header|EchoLisp}}==
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3
1
</pre>
 
=={{header|EMal}}==
<syntaxhighlight lang="emal">
Map map = text%text["Italy" => "Rome", "France" => "Paris"]
map.insert("Germany", "Berlin")
map["Spain"] = "Madrid"
writeLine("== pairs ==")
for each Pair pair in map
writeLine(pair)
end
writeLine("== keys ==")
for each text key in map.keys()
writeLine(key)
end
writeLine("== values ==")
for each text value in map.values()
writeLine(value)
end
</syntaxhighlight>
{{out}}
<pre>
== pairs ==
[Italy,Rome]
[France,Paris]
[Germany,Berlin]
[Spain,Madrid]
== keys ==
Italy
France
Germany
Spain
== values ==
Rome
Paris
Berlin
Madrid
</pre>
 
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Note that this last is not likely to be useful in any practical context outside of learning the language.
 
=={{header|JavaJakt}}==
<syntaxhighlight lang="javajakt">Map<String, Integer> map = new HashMap<String, Integer>();
fn main() {
map.put("hello", 1);
let dictionary = ["foo": 1, "bar": 2]
map.put("world", 2);
for entry in dictionary {
map.put("!", 3);
// To get values, use
// let value = entry.1
println("{}", entry)
}
 
// Just keys
// iterating over key-value pairs:
for key in dictionary.keys() {
for (Map.Entry<String, Integer> e : map.entrySet()) {
String key = e.getKey println("{}", key);
}
Integer value = e.getValue();
System.out.println("key = " + key + ", value = " + value);
}
</syntaxhighlight>
{{out}}
<pre>
("bar", 2)
("foo", 1)
bar
foo
</pre>
 
=={{header|Java}}==
// iterating over keys:
<p>
for (String key : map.keySet()) {
See also, [https://rosettacode.org/wiki/Associative_array/Creation#Java Java - Associative array/Creation].
System.out.println("key = " + key);
</p>
}
<p>
 
You can access the <kbd>key</kbd> and <kbd>value</kbd> pairs by using the <code>Map.entrySet</code> method,
// iterating over values:
which will return a <code>Map.Entry</code>.<br />
for (Integer value : map.values()) {
It's worth noting that a <code>Map.Entry</code> also has the <code>setValue</code> method.
System.out.println("value = " + value);
</p>
}</syntaxhighlight>
<syntaxhighlight lang="java">
for (Map.Entry<String, Integer> entry : map.entrySet())
System.out.println(entry);
</syntaxhighlight>
<p>
You can access just the <kbd>key</kbd>s by using the <code>Map.keySet</code> method, which will return a <code>Set</code>.
</p>
<syntaxhighlight lang="java">
for (String key : map.keySet())
System.out.println(key);
</syntaxhighlight>
<p>
And you can access just the <kbd>value</kbd>s by using the <code>Map.values</code> method, which will return a <code>Collection</code>.
</p>
<syntaxhighlight lang="java">
for (int value : map.values())
System.out.println(value);
</syntaxhighlight>
<br />
 
Java 8 version
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=={{header|Kotlin}}==
<syntaxhighlight lang="scala">fun main(a: Array<String>) {
val map = mapOf("hello" to 1, "world" to 2, "!" to 3)
 
with(map) {
entries.forEach { println("key = ${it.key}, value = ${it.value}") }
keys.forEach { println("key = $it") }
values.forEach { println("value = $it") }
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=={{header|Sidef}}==
<syntaxhighlight lang="ruby">var hash = Hash.new(
key1 => 'value1',
key2 => 'value2',
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# Iterate over key-value pairs
hash.each { |key, value|
say "#{key}: #{value}";
}
 
# Iterate only over keys
hash.keys.each { |key|
say key;
}
 
# Iterate only over values
hash.values.each { |value|
say value;
}</syntaxhighlight>
{{out}}
Line 4,276 ⟶ 4,324:
 
=={{header|UNIX Shell}}==
TwoAt least two shells have associative arrays, but they use different syntax to access their keys.
 
{{works with|ksh93}}
{{works with|bash|4.0 and above}}
<syntaxhighlight lang="bash">typeset -A a=([key1]=value1 [key2]=value2)
 
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=={{header|Wren}}==
Note that Wren makes no guarantee about iteration order which is not necessarily the same order in which the entries were added.
<syntaxhighlight lang="ecmascriptwren">// create a new map with four entries
var capitals = {
"France": "Paris",
Grondilu
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