To supplement what mscdex has already posted, here are two more articles:
http://dailyjs.com/2012/10/15/preparing-for-esnext/
https://brendaneich.com/2012/10/harmony-of-dreams-come-true/
You'l want to check out Set's. Enable them with `node --harmony` at
runtime. Also, v8 doesn't support Set initialization with an Array. So
you'll have to use .add() for every element. But they are about 6 times
faster than using an Object lookup. Sort of like the following:
var the_set = new Set();
the_array.forEach(function(i) { the_set.add(i); });
As a side note, your syntax is incorrect. The forEach statement should look
like the following:
the_array.forEach(function(i) { the_lookup[i] = true; });
On Tuesday, October 30, 2012 2:50:25 PM UTC-7, Felipe Gasper wrote:
>
> (Sorry, this is slightly OT.)
>
> var the_array = ["foo", "bar", "baz", "qux"];
>
> //Is there a simpler way to do the following than what�s here?
> var the_lookup = {};
> the_array.forEach( function(i) { the_lookup.i = true } );
>
> ========
>
> In Perl this is easy:
> my @array = qw(foo bar baz qux);
> my %lookup = map { $_ => 1 } @array;
>
>
> Anything of the sort coming in JS, does anyone know? Maybe in some of
> the newer ES5 goodies?
>
> -FG
>
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