Comparison of programming languages (associative array): Difference between revisions

Revision as of 02:51, 22 August 2024

Revision as of 02:54, 22 August 2024

Line 177:

Initializing an empty dictionary and adding items in [[Cobra (programming language)|Cobra]]:

{{sxhl|2=python|1=<nowiki/>

dic as Dictionary<of String, String> = Dictionary<of String, String>()

dic.add('Sally Smart', '555-9999')

dic.add('John Doe', '555-1212')

dic.add('J. Random Hacker', '553-1337')

assert dic['Sally Smart'] == '555-9999'

}}

Alternatively, a dictionary can be initialized with all items during construction:

{{sxhl|2=python|1=<nowiki/>

dic = {

'Sally Smart':'555-9999',

'John Doe':'555-1212',

'J. Random Hacker':'553-1337'

}

}}

The dictionary can be enumerated by a for-loop, but there is no guaranteed order:

{{sxhl|2=python|1=<nowiki/>

for key, val in dic

print "[key]'s phone number is [val]"

}}

Line 723:

Declare dictionary:

<syntaxhighlight lang="julia">

phonebook = Dict( "Sally Smart" => "555-9999", "John Doe" => "555-1212", "J. Random Hacker" => "555-1337" )

</syntaxhighlight>

Access element:

<syntaxhighlight lang="julia">

phonebook["Sally Smart"]

</syntaxhighlight>

Add element:

<syntaxhighlight lang="julia">

phonebook["New Contact"] = "555-2222"

</syntaxhighlight>

Delete element:

<syntaxhighlight lang="julia">

delete!(phonebook, "Sally Smart")

</syntaxhighlight>

Get keys and values as [[Iterator#Implicit iterators|iterables]]:

<syntaxhighlight lang="julia">

keys(phonebook)

values(phonebook)

</syntaxhighlight>

===KornShell 93, and compliant shells===

Line 1,069 ⟶ 1,074:

<syntaxhighlight lang="mathematica">

phonebook = <| "Sally Smart" -> "555-9999",

"John Doe" -> "555-1212",

"J. Random Hacker" -> "553-1337" |>;

</syntaxhighlight>

Line 1,077 ⟶ 1,082:

<syntaxhighlight lang="mathematica">

phonebook[[Key["Sally Smart"]]]

</syntaxhighlight>

Line 1,083 ⟶ 1,088:

<syntaxhighlight lang="mathematica">

phonebook[["Sally Smart"]]

</syntaxhighlight>

Line 1,220 ⟶ 1,225:

<syntaxhighlight lang=Java>

String[String] phoneBook = {

"Sally Smart" -> "555-9999",

"John Doe" -> "555-1212",

"J. Random Hacker" -> "553-1337"

};

Line 1,229 ⟶ 1,234:

// iterate over the values

for (String number : phoneBook) {

System.out.println(number);

}

Line 1,236 ⟶ 1,241:

// iterate over the keys

for (String name : phoneBook.keys) {

System.out.println(name + " -> " + phoneBook[name]);

}

// phoneBook[name] access a value by a key (it looks like java array access)

Line 1,247 ⟶ 1,252:

<syntaxhighlight lang=Java>

int[String][][double] a;

java.util.Map<String[Object], Integer> b;

</syntaxhighlight>