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javascript sets?

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Nov 04.2003

Instead of looping through an array to find an element, is it possible to create a set in JavaScript?

I wanna be able to do something like this:

myset = (’10’,’20’,’abc’,’hi’)
…
if (curVar In myset) {dosomething}

is this possible in JavaScript… couldn’t find it using search.

Thanks in advance.

Tom

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JavaScript

4 Comments(s) ↴

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@CharlesNov 04.2003 — [font=georgia]Just use an Object literal to create an associative Array of Booleans [i]a la[/i] a Perl hash.[/font]

[font=monospace]<script type="text/javascript">

<!--

mySet = {10:1, 20:1,abc:1, hi:1}

alert(Boolean (mySet[20]))

// -->

</script>[/font]
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@tniedobaauthorNov 04.2003 — I modified it slightly to the following, works great!

mySet = {10:1, 20:1, 30:1};

if (!mySet[30]) {alert("not in set!");}

Thanks!
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@tniedobaauthorNov 04.2003 — With the above code working, I'm having a problem accessing the data in the set...


How would i return the 1st element in the set?

if I was looping using x, how could i get the x'th item?
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@tniedobaauthorNov 04.2003 — For those interested, the solution is as follows:

for (var myItem in mySet)

alert(myItem); //this gives the 1st value of each pair

alert(mySet[myItem]); //gives the 2nd value

Unfortunately it seems that the .length property is not used in associated arrays as far as I know, but so far I have not needed it.
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