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Associative array/Creation: Difference between revisions
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m = { 'foo' => 42, 'bar' => 100 } # with ordered keys
h = { 'foo' -> 42, 'bar' -> 100 } # with unordered keys</lang>
=={{header|Dart}}==
<lang javascript>
main() {
var rosettaCode = { // Type is inferred to be Map<String, String>
'task': 'Associative Array Creation'
};
rosettaCode['language'] = 'Dart';
// The update function can be used to update a key using a callback
rosettaCode.update( 'is fun', // Key to update
(value) => "i don't know", // New value to use if key is present
ifAbsent: () => 'yes!' // Value to use if key is absent
);
assert( rosettaCode.toString() == '{task: Associative Array Creation, language: Dart, is fun: yes!}');
// If we type the Map with dynamic keys and values, it is like a JavaScript object
Map<dynamic, dynamic> jsObject = {
'key': 'value',
1: 2,
1.5: [ 'more', 'stuff' ],
#doStuff: () => print('doing stuff!') // #doStuff is a symbol, only one instance of this exists in the program. Would be :doStuff in Ruby
};
print( jsObject['key'] );
print( jsObject[1] );
for ( var value in jsObject[1.5] )
print('item: $value');
jsObject[ #doStuff ](); // Calling the function
print('\nKey types:');
jsObject.keys.forEach( (key) => print( key.runtimeType ) );
}
</lang>
{{out}}
<pre>
value
2
item: more
item: stuff
doing stuff!
Key types:
String
int
double
Symbol
</pre>
=={{header|Delphi}}==
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