Is there a way to query only one element among descendants?

[mtskf]

I'm looking for a way to query a first-matching element among descendants like .querySelector() in html.
.findAllElements('...').first queries all the matching elements and costly, and I need just only one.

I'd appreciate if you could advise! Thanks 😊

[renggli]

findAllElements returns a lazy Iterable (see the documentation, there is no List with all elements created). The iterable doesn't do anything until you actually iterate over the elements.

When you call first on the iterator, it starts to traverse the tree until it finds the first matching element, aborts the traversal, and returns that element. Check out the Dart tutorial on Iterable collections for other operations.

[mtskf]

@renggli
Thank you! 👍