redundant "Set.from" in the map docs

[amit-dagan-remepy]

Page URL

https://dart.dev/libraries/dart-core

Page source

https://github.com/dart-lang/site-www/blob/main/src/content/libraries/dart-core.md

Describe the problem

in the doc

---

var hawaiianBeaches = {
'Oahu': ['Waikiki', 'Kailua', 'Waimanalo'],
'Big Island': ['Wailea Bay', 'Pololu Beach'],
'Kauai': ['Hanalei', 'Poipu'],
};

// Get all the keys as an unordered collection
// (an Iterable).
var keys = hawaiianBeaches.keys;

assert(keys.length == 3);
assert(Set.from(keys).contains('Oahu'));

no need to Set.from(keys)

Expected fix

var hawaiianBeaches = {
'Oahu': ['Waikiki', 'Kailua', 'Waimanalo'],
'Big Island': ['Wailea Bay', 'Pololu Beach'],
'Kauai': ['Hanalei', 'Poipu'],
};

// Get all the keys as an unordered collection
// (an Iterable).
var keys = hawaiianBeaches.keys;

assert(keys.length == 3);
assert(keys.contains('Oahu'));

Additional context

No response

I would like to fix this problem.

• I will try and fix this problem on dart.dev.

[harshyadavDeveloper]

@amit-dagan-remepy Hi, I've opened PR #7318 for this.
The example now uses:
assert(keys.contains('Oahu'));
instead of:
assert(Set.from(keys).contains('Oahu'));
and the corresponding test has been updated as well.
Could you take a look and let me know if this matches what you had in mind?