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Property set, {n1:v1, n2:v2}

Posted on 2006-12-01
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Last Modified: 2010-05-18
I sometimes see names and values are paired like {name1:value1, name2:value2}.
Is there a name for this kind of grouping?
And are there any tutorials or articles that I can read about this?
Like those cover tips, tricks, scoping issues or things like that?
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Question by:nagunpyo
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HonorGod earned 200 total points
ID: 18058633
An associated array, sometimes called a hash.

It may be a literal associative array, e.g.,

  var  pairs = { 'Sun' : 0, 'Mon' : 1, 'Tue' : 2, 'Wed' : 3, 'Thu' : 4, 'Fri' : 5, 'Sat' : 6 };

  To access a value, use the name as an index into the array:

  var here = pairs[ 'Mon' ];
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by:gops1
gops1 earned 100 total points
ID: 18059044
In general they are many a times it is associated to HashMap in Java since both of them work on key value pair. Here a value is identified with its key and not on row column address as we do in a normal array. If we take Honor's example

var  pairs = { 'Sun' : 0, 'Mon' : 1, 'Tue' : 2, 'Wed' : 3, 'Thu' : 4, 'Fri' : 5, 'Sat' : 6 };

'Sun', 'Mon' etc are the keys and what comes after ":" are the values, therefore to pick a value, it should be identified by its key:

alert(pairs[ 'Mon' ]);

this will alert "1"
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by:ahoffmann
ahoffmann earned 100 total points
ID: 18059390
> Is there a name for this kind of grouping?
object literals
this is ECMAScript standard (v3 IIRC), and used in JavaScript since 1.2
it's mainly used for initialising objects
JSON makes heavy use of this.
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by:aescnt
aescnt earned 100 total points
ID: 18062232
Go check www.json.org.

JSON stands for JavaScript Object Notation, which is JS's syntax for doing name/value pairs and arrays.
  { animals: ["duck", "cow"], dog: "bark", dogCount: 55 }

By the way, what the website JSON.org is about is that JS's object notation syntax is very simple and effective, that it can even be used outside JavaScript as, say, a replacement for XML :)
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by:nagunpyo
ID: 18063273
Thank you everyone. :-D
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Expert Comment

by:HonorGod
ID: 18065077
You're welcome.  Thanks for the 'A'.  Good luck
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