Simply Spread
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Simply Spread
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Asked
7 years, 2 months ago
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This doesn't work in Safari(8) or Chrome (41). But it does work in Firefox(35) though.
– 425nesp
Apr 2 '15 at 5:33
var array = [v for (v of mySet)]; does not work in chrome 46
– Eric
Oct 27 '15 at 21:36
I think the most elegant way is simply [...mySet] .
– Wojciech Bednarski
Mar 10 '16 at 12:49
@WojciechBednarski l33t is not elegant . If any of the examples are that, it's Array.from(mySet);
– Buffalo
May 4 '17 at 6:35
Just wanted to add that [...mySet] has issues when compiled using Typescript (see this issue ), so probably safer to use Array.from(mySet) if you intend to convert to Typescript in the near future.
– Ivan Gozali
Mar 11 '19 at 16:24
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why a downvote ? are there any problems with this approach ? Or somebody tried to execute this code in IE11 and failed ? ;)
– c69
Oct 9 '14 at 8:49
I didn't downvote, but I tried this in the latest version of Chrome and failed, so it's not just an IE issue.
– Meshaal
Mar 19 '15 at 4:45
refer to kangax.github.io/compat-table/es6 for more or less up-to-date support chart. Currently, of all desktop browsers, only FF and IE TP (aka Spartan, aka MS Non-IE browser) support Array.from and ...
– c69
Mar 19 '15 at 23:58
Looks like Firefox is the only browser to support Array.from . developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– 425nesp
Apr 2 '15 at 5:27
Here you can enable it for Chrome chrome://flags/#enable-javascript-harmony Remember it's experimental don't think for moment that this is a good solution for development.
– sospedra
Jun 15 '15 at 11:11
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Unluckily the only cross-broser solution
– Marco Sulla
Apr 2 '19 at 8:12
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It seems that using the set.entries() you will get array of pairs. You can use set.values() to get the plain array.
– Shimon Rachlenko
Jan 13 '16 at 13:14
@ShimonRachlenko true, and the user did ask for that.
– Roland
Jan 13 '16 at 16:01
You can just use var array = Array.from(set);
– Buffalo
May 4 '17 at 6:36
this answer is just wrong. You don't need the call to .entries , nor .values . As @Buffalo mentioned above - Array.from(set) is enough.
– c69
Oct 23 '18 at 2:12
@c69 that is true. At the time of this answer, Array.from() did not work as expected. But now spread and Array.from() both work just fine.
– Roland
Oct 23 '18 at 9:50
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..and this is what?
– ZF007
Dec 31 '19 at 11:20
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Set seems like a nice way to create Arrays with guaranteed unique elements, but it does not expose any good way to get properties, except for generator [Set].values, which is called in an awkward way of mySet.values.next() .
This would have been ok, if you could call map and similar functions on Sets. But you cannot do that, as well.
I've tried Array.from , but seems to be converting only array-like (NodeList and TypedArrays ?) objects to Array. Another try: Object.keys does not work for Sets, and Set.prototype does not have similar static method.
So, the question: Is there any convenient inbuilt method for creating an Array with values of a given Set ? (Order of element does not really matter).
if no such option exists, then maybe there is a nice idiomatic one-liner for doing that ? like, using for...of , or similar ?
if no such option exists, then maybe there is a nice idiomatic
one-liner for doing that ? like, using for...of, or similar ?
Indeed, there are several ways to convert a Set to an Array :
Simply spreading the Set out in an array
The old fashion way, iterating and pushing to a new array (Sets do have forEach )
Previously, using the non-standard, and now deprecated array comprehension syntax:
It turns out, we can use spread operator:
Or, alternatively, use Array.from :
Assuming you are just using Set temporarily to get unique values in an array and then converting back to an Array, try using this:
This relies on using underscore or lo-dash .
Perhaps to late to the party, but you could just do the following:
This should work without problems in browsers that have support for ES6 or if you have a shim that correctly polyfills the above functionality.
Edit : Today you can just use what @c69 suggests:
Use spread Operator to get your desired result
Using Set and converting it to an array is very similar to copying an Array...
So you can use the same methods for copying an array which is very easy in ES6
An array and now you can use all methods that you can use for an array...
The code below creates a set from an array and then, using the ... operator.
Here is an easy way to get only unique raw values from array. If you convert the array to Set and after this, do the conversion from Set to array. This conversion works only for raw values, for objects in the array it is not valid. Try it by yourself.
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