Programming

17476 readers

132 users here now

Welcome to the main community in programming.dev! Feel free to post anything relating to programming here!

Cross posting is strongly encouraged in the instance. If you feel your post or another person's post makes sense in another community cross post into it.

Hope you enjoy the instance!

Rules

Follow the programming.dev instance rules
Keep content related to programming in some way
If you're posting long videos try to add in some form of tldr for those who don't want to watch videos

Wormhole

Follow the wormhole through a path of communities !webdev@programming.dev

founded 1 year ago

MODERATORS

snowe@programming.dev

Ategon@programming.dev

MaungaHikoi@lemmy.nz

Code Smells Catalog (luzkan.github.io)

submitted 2 months ago by lysdexic@programming.dev to c/programming@programming.dev

23 comments fedilink hide all child comments

you are viewing a single comment's thread
view the rest of the comments

[–] mbtrhcs 3 points 2 months ago (1 children)

Yeah, in Java calling first() on a stream is the same as an early return in a for-loop, where for each element all of the previous stream operations are applied first.

So the stream operation

cars.stream()
    .filter(c -> c.year() < 1977)
    .first()

is equivalent to doing the following imperatively

for (var car : cars) {
    if (car.year() < 1977) return car;
}

Not to mention Kotlin actually supports non-local returns in lambdas under specific circumstances, which allows for even more circumstances to be expressed with functional chaining.

[–] nous@programming.dev 4 points 2 months ago (1 children)

These are not quite equivalent. In terms of short-circuiting yeah they both short-circuit when they get the value. But the latter is returning from the current function and the former is not. If you add a return to that first example then they are equivalent. But then cannot be used in line. Which is a nice advantage to the former - it can be used inline with less faff as you can just assign the return to a value. The latter needs you to declare a variable, assign it and break from the loop in the if.

Personally I quite like how the former requires less modification to work in different contexts and find it nicer to read. Though not all logic is easier to read with a stream, sometimes a good old for loop makes the code more readable. Use which ever helps you best at each point. Never blindly apply some pattern to every situation.

[–] mbtrhcs 4 points 2 months ago

Well yes, I was simplifying because I wanted to address the main (incorrect) criticism by @spartanatreyu@programming.dev. I agree with your comment