number closest to 0 | Together Java | Page 1

worn epoch Jul 2, 2024, 6:42 PM

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Tried googling but i actually found close to 0 😉
i thought i could abs and then min but that changes the number so ye. i need it between 2 numbers

balmy latchBOT Jul 2, 2024, 6:42 PM

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<@&987246399047479336> please have a look, thanks.

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TJ-Bot

Tried googling but i actually found close to 0 😉 i thought i could abs and then min but that changes the number so ye. i need it between 2 numbers

You can achieve this by using a custom comparison function with Collections.min() or by iterating through the list and finding the number closest to 0. Here's an example using Collections.min():

import java.util.*;

public class ClosestToZero {
    public static void main(String[] args) {
        List<Integer> numbers = Arrays.asList(-4, 3, -1, 5, -2);
        
        int closestToZero = Collections.min(numbers, Comparator.comparingInt(Math::abs));
        
        System.out.println("Number closest to 0: " + closestToZero);
    }
}

This code will output "Number closest to 0: -1", as -1 is the number in the list that is closest to 0 in terms of absolute distance. You can adjust the list of numbers as needed for your specific use case.

worn epoch Jul 2, 2024, 6:43 PM

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balmy latch

well thats kind of dumb for 2 numbers

dire adder Jul 2, 2024, 6:44 PM

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worn epoch Tried googling but i actually found close to 0 😉 i thought i could abs and then...

whole numbers?

worn epoch Jul 2, 2024, 6:45 PM

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doubles

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both positive and negative

last wren Jul 2, 2024, 6:45 PM

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no, abs doesn't change the number

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it simply flips a sign bit

worn epoch Jul 2, 2024, 6:46 PM

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it does change from -1 to 1

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like

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if i have -2 and 4

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i want to get -2

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with my method i would get 2

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i mean i can do this manually but its something i would expect a method to already exist for

last wren Jul 2, 2024, 6:48 PM

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remember the original numbers

worn epoch Jul 2, 2024, 6:48 PM

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wdym

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so i have to make a custom utility method for this?

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does this actually not exist

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sounds like such a basic thing tbh

worn epoch Jul 2, 2024, 6:50 PM

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last wren remember the original numbers

this should work right?

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ig i dont need that else

last wren Jul 2, 2024, 6:51 PM

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yeah

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can be ternary

worn epoch Jul 2, 2024, 6:51 PM

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actulal

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ye

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just changed it XD

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i shouldnt inline it tho right

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always have the urge to do that with ternaries

dire adder Jul 2, 2024, 7:03 PM

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worn epoch it does change from -1 to 1

if you're talking about distance, then youll want abs

worn epoch Jul 2, 2024, 7:04 PM

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Well yes

worn epoch Jul 2, 2024, 7:05 PM

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worn epoch this should work right?

I just did this

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With a ternary ofc but that was the first version

forest shell Jul 3, 2024, 1:15 AM

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This method seems like busy work to whatever its being used for. For example, what if both numbers are equal. Or what if they are both infinity or NaN. Is the value returned still meaningful, or would assuming some state (first is closer than second) and returning a boolean make more sense?

dire adder Jul 3, 2024, 1:36 AM

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forest shell This method seems like busy work to whatever its being used for. For example, w...

could add some checks to optimize, but the idea of distance seemed to be the problem

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could just be an assignment

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but you're right, it should be looked at from a productive view

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should check if the numbers are equal, should consider whether isFurther should be the proper tool

worn epoch Jul 3, 2024, 6:47 AM

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dire adder could just be an assignment

Nope I actually needed it but I got it working. If both are equal it doesn’t matter which one I get of course because they are the same

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I just need to make sure there isn’t a smaller number because if so I need that one

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Or bigger if it’s negative ofc

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I don’t have the code with me tho I forgot to push

dire adder Jul 3, 2024, 6:47 AM

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worn epoch Nope I actually needed it but I got it working. If both are equal it doesn’t mat...

would help avoid the abs operations, in the case that they are equal

worn epoch Jul 3, 2024, 6:48 AM

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So I can’t look at what I actually did

worn epoch Jul 3, 2024, 6:48 AM

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dire adder would help avoid the `abs` operations, in the case that they are equal

Why do I aboid abs?

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Def doesn’t seem like an expensive call to me

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Extra check makes it way more complicated

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And the result will be the exact same

dire adder Jul 3, 2024, 6:49 AM

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not that much more complicated, and could save some time if the method is hot (called very frequently). but to each their own

worn epoch Jul 3, 2024, 6:49 AM

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I don’t understand how a check like that is faster than abs

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Abs is just inverting a number and a check

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And only in a single case

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Sounds like it would be slower in every case except if they are equal

dire adder Jul 3, 2024, 6:50 AM

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because an equality check takes a lot less than 2 abs calls

worn epoch Jul 3, 2024, 6:50 AM

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And they are practically never equal

worn epoch Jul 3, 2024, 6:50 AM

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dire adder because an equality check takes a lot less than 2 `abs` calls

Does it?

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Thought abs was just flipping a bit after a check

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But ye the chance of them being equal is quite small

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It will be called a lot tho

dire adder Jul 3, 2024, 6:52 AM

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Double.longBitsToDouble(Double.doubleToRawLongBits(a) & DoubleConsts.MAG_BIT_MASK);

worn epoch Jul 3, 2024, 6:52 AM

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So idk if it’s worth it

dire adder Jul 3, 2024, 6:52 AM

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could always benchmark it

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but not a huge deal, unless you need to optimize

worn epoch Jul 3, 2024, 6:52 AM

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dire adder could always benchmark it

Idk how to do something like that

worn epoch Jul 3, 2024, 6:52 AM

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dire adder but not a huge deal, unless you need to optimize

I don’t think I need to

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It’s called multiple times every tick tho (mc tick aka 20 times a second)

dire adder Jul 3, 2024, 6:53 AM

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and if they're doubles, the numbers being equal will be uncommon

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unless its within a very small range

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i feel ya

worn epoch Jul 3, 2024, 6:53 AM

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dire adder and if they're doubles, the numbers being equal will be uncommon

Ye that’s my point

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It’s like distance from a point to the floor

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But the points move together

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And are diff heights

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So the floor would have to be aligned perfectly with multiple points for it to be equal

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And I don’t see that happening a lot unless someone does that on purpose but even then I’m not sure if it’s even possible with the blocks in the game to perfectly align it

dire adder Jul 3, 2024, 7:01 AM

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it was more "food for thought", spanish was trying to point out it's simplicity, and that it could probably benefit from handling corner-cases

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no need to worry about it though, dont prematurely optimize

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just if there are some obvious corner cases that could avoid excess processing, always good to account for them

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equality check doesnt seem like one you should worry about though

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could be cases that better apply to your situation, but wouldnt recommend putting much thought into it if you cant think of any off the top of your head

worn epoch Jul 3, 2024, 7:05 AM

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Fair enough

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May I ask what’s bad about prematurely optimizing?

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Wouldn’t that be easier than having to find out what the issue is after you realize it is slow and implemented like 10 thinfs

dire adder Jul 3, 2024, 7:05 AM

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its better to use a tool to find where you can optimize. otherwise you may waste a lot of time optimizing something that only benefits little

worn epoch Jul 3, 2024, 7:05 AM

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Not that I ever prematurely optimize because I’m not great at optimizing

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Oh i didn’t even know there were tools for that 🤣

dire adder Jul 3, 2024, 7:06 AM

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profilers, benchmarking tools, etc..

worn epoch Jul 3, 2024, 7:06 AM

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Ah

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Ye I have never really understood how to use the profiler properly 🤣

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Haven’t rly needed to as mc has profiling tools built in and those are way better for optimizing

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I guess those are benchmarking tools

dire adder Jul 3, 2024, 7:07 AM

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sorta. spark, yeah?

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at least thats the one i was shown

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its pretty good, should cover most MC needs

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the tool i saw, spark, uses JFR, which is the same tool used in JMC (a popular Java profiling tool)

worn epoch Jul 3, 2024, 7:09 AM

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Oh I just use the in game command

dire adder Jul 3, 2024, 7:09 AM

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ah, then that probably gives less info

worn epoch Jul 3, 2024, 7:09 AM

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dire adder the tool i saw, spark, uses JFR, which is the same tool used in JMC (a popular J...

Mc has /jfr command too

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But I don’t understand it

worn epoch Jul 3, 2024, 7:10 AM

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dire adder ah, then that probably gives less info

Ye but that’s probably the reason why I understand it

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It just says what % of time in a tick is spent on a specific thing and it has a lot of other info too

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But the % is the most useful

dire adder Jul 3, 2024, 7:10 AM

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yup, which is good for most cases in terms of MC

worn epoch Jul 3, 2024, 7:10 AM

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The flame chart you get from the jfr is super confusing

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It just gives the number of objects for each class or something idk doesn’t seem that useful

dire adder Jul 3, 2024, 7:11 AM

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could you show me what info it gives? im curious

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whenever you have time

worn epoch Jul 3, 2024, 7:11 AM

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I can’t rn because I’m on my phone but

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I’ll send over a report later

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It even has a folder with ticks that are longer than normal analyzed

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So like if you only get it once every 5 ticks you can see what is causing it by comparing to the average

dire adder Jul 3, 2024, 7:12 AM

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thats pretty nice

worn epoch Jul 3, 2024, 7:13 AM

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Yep

dire adder Jul 3, 2024, 7:13 AM

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gotta give props to the MC world for having tools like that easily accessible

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didnt know it was like that

worn epoch Jul 3, 2024, 7:13 AM

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Gotta give credit to mojang for that

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They added it themselves

dire adder Jul 3, 2024, 7:14 AM

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smart move

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but thats for the client, yeah?

worn epoch Jul 3, 2024, 7:14 AM

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It also gives server info if you’re on singleplayer

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Im not sure if you can trigger a report on multiplayer with a server side command though

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Might do it if you are OP

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Not sure

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But ye there is also /jfr tho idk how useful that is as I don’t understand it

dire adder Jul 3, 2024, 7:16 AM

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i might dive into it later, wanna see what info they include

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what info they feel is important for troubleshooting MC

worn epoch Jul 3, 2024, 7:16 AM

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I’ll send one when I’m home if you want but that’ll be a long while

worn epoch Jul 3, 2024, 7:17 AM

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dire adder what info they feel is important for troubleshooting MC

Most stuff is quite useful but you def also need debug mode along with it

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Or you just add your own profiling steps

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To further pin down where the problem is

dire adder Jul 3, 2024, 7:18 AM

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im just curious if they provide classloading info, allocations, stuff like that

worn epoch Jul 3, 2024, 7:18 AM

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I think they do provide some info like that

dire adder Jul 3, 2024, 7:18 AM

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oh wait a sec

worn epoch Jul 3, 2024, 7:19 AM

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Cant see what’s in the files but that’s the structure

dire adder Jul 3, 2024, 7:19 AM

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its /jfr start and /jfr stop

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it just generated a JFR file

worn epoch Jul 3, 2024, 7:19 AM

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No no

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That’s the jfr

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You can also hold f3 and press L

dire adder Jul 3, 2024, 7:19 AM

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yeah, thats the one im curious about

worn epoch Jul 3, 2024, 7:20 AM

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Ye you need to hold the f3 key down and then press l and it’ll start profiling for 10 seconds

dire adder Jul 3, 2024, 7:20 AM

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its not some sugar coated profiling

worn epoch Jul 3, 2024, 7:20 AM

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Tho you can stop early by pressing it again

worn epoch Jul 3, 2024, 7:20 AM

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dire adder its not some sugar coated profiling

Wdym

dire adder Jul 3, 2024, 7:20 AM

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its an actual profile, probably configured to capture quite a bit

worn epoch Jul 3, 2024, 7:20 AM

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Ye

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It’s useful

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I use it all the time if I need to get some info about lag or something

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Funny how we both learnt something

dire adder Jul 3, 2024, 7:26 AM

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yeah, gotta love these platforms. great way to learn, to teach, and to get humbled in some situations

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definitely rose my interest in the MC domain

worn epoch Jul 3, 2024, 7:44 AM

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Cool

#number closest to 0