The Big Programming Thread - Page 931

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Thread Rules
1. This is not a "do my homework for me" thread. If you have specific questions, ask, but don't post an assignment or homework problem and expect an exact solution.
2. No recruiting for your cockamamie projects (you won't replace facebook with 3 dudes you found on the internet and $20)
3. If you can't articulate why a language is bad, don't start slinging shit about it. Just remember that nothing is worse than making CSS IE6 compatible.
4. Use [code] tags to format code blocks.

Manit0u

Poland17546 Posts

December 16 2017 10:49 GMT

#18601

On December 16 2017 03:15 phar wrote:
sequential write speed of your SSD (what, 500MB/s or higher now?)

NVMe SSDs do > 2GB write and > 3.5GB read. Times, they are a changing

http://www.samsung.com/semiconductor/minisite/ssd/product/consumer/ssd960.html

WarSame

Canada1950 Posts

December 16 2017 19:38 GMT

#18602

What IDE would y'all recommend for working with SpringBoot? I've been using Spring Tool Suite but it has been very annoying and doesn't seem that great. It seems like Intellij IDEA only works for Spring if you get the paid edition. Are there any other good choices that I've missed?

Manit0u

Poland17546 Posts

December 16 2017 20:01 GMT

#18603

Intellij is the best. Other than that you're left with free options, none of which are really that good.

WarSame

Canada1950 Posts

December 16 2017 22:37 GMT

#18604

Fuck. That's what I was thinking but I'm not willing to drop money on it when I'm just doing this to see if I like Spring Boot.

Manit0u

Poland17546 Posts

December 16 2017 22:58 GMT

#18605

On December 17 2017 07:37 WarSame wrote:
Fuck. That's what I was thinking but I'm not willing to drop money on it when I'm just doing this to see if I like Spring Boot.

Well, you can always just go with free evaluation for 30 days. After this runs out you can still use the IDE (it will just auto-close itself every so often - 30-45 minutes if I remember correctly) without a problem. You can also get your free evaluation and during that time sign up for the EAP, which will allow you to use this software for free until next stable release (should be about 3-4 months or so judging by their usual release cycles). My friend used to ride PHPStorm early access program for over 6 months without paying a dime.

Plenty of time to try stuff out

Deleted User 3420

24492 Posts

December 17 2017 16:26 GMT

#18606

Which of these setups sound faster to you guys?

Scenario: I have many large integer values, and tied to each one of those are several other key small values. Let's call these values V, A, B, C, and D.

I want to do arithmetic between the V values, but only if I can match their respective A values, or match their respective B values, or match one's A to the other's B(but not both), AND if the V values have certain things in common. After doing arithmetic, I will need to alter the values V, A, B, C, D, and get rid of duplicate Vs, keeping only the unique V entry with the highest C value. (im sorry if this is hard to follow).

Which sounds like a more efficient setup:

1.) A list of (V,A,B,C,D), and a hashmap with keys [A] and keys [B], where the keys point to indices of the list that have that A or B in their tuple. I will iterate the list, and for each tuple I will look up the indices that keys A and B point to, and make comparisons between those tuples and this tuple.

If they meet the criteria, I will perform arithmetic and put the new (V,A,B,C,D) into a NEW list. And create a NEW hashmap with keys A and B, these will be updated from all the arithmetic in this information. As I create the new list, I will look for duplicate V values by sorting the list as I go (inserting each V into an appropriate index so as to keep it sorted).

vs

2.) A hashmap of keys [V], where each key V points to a tuple (A,B,C,D). I then also have a hashmap of [A] and [B] keys, that each point to a list of Vs that have that A or B in their tuple. I will then iterate my hashmap of keys V, looking at each tuple. For each tuple, I will look up A and B in my hashmap. For each lookup, I will get a list of Vs. For each of those Vs, I will look up their tuple (A,B,C,D). I will then make comparisons.

If the criteria has been met, I will do arithmetic on the Vs and form an updated tuple (A,B,C,D), put the new V into a NEW hashmap as a key, and the new tuple as it's entry. Create another new hashmap, and the keys A and B in that tuple will point to a new list, with V as an entry in it. HOWEVER, when this process starts, if V was already a key in the new hashmap(signalling a duplicate), then I look up it's tuple and make comparisons. Then I can either replace the old one with the new, or simply not add the new one.

vs -

some other method entirely?

space and time are both a concern., but probably moreso time
thanks!

Manit0u

Poland17546 Posts

December 18 2017 08:23 GMT

#18607

On December 15 2017 02:57 Acrofales wrote:
I'm assuming the first two steps are performed simultaneously. If not (you first do the even numbers and after that the odd numbers, then modify accordingly. And if the operations are done inplace, that's another different solution. Can all still be done in the same loop, though:

+ Show Spoiler +


def dumbstuff():
  values = list()
  values.append(2)
  values.append(1000000 + 2*999999)
  foreach i in range(1, 1000000):
    if i%2 == 0:
       values.append(5*i)
    else:
       if floor(i/3)%2 == 0:
         values.append(i/3)
  avg = mean(values)
  return sorted(filter(lambda v: abs(v - avg) > 1, values), reverse=True)

I hope I wasn't dumb there.

E: added code tags

1. After adding 2 values for the min and max ids your range should be 1..999999
2. You forgot to floor i/3 when appending

Tried your solution in ruby


ids = [2, (1_000_000 + 2 * 999_999)] + (1..999_999).inject([]) { |agg, x|
  y = x.even? ? x * 5 : (x / 3).round
  agg << y if y.even?
  agg
}

avg = ids.reduce(:+) / ids.count

puts ids.select { |x| (x - avg).abs > 1 }.sort.reverse.count

Oddly enough the resulting array has 1 extra id compared to my previous solution. I'll have to dig deeper into it

sc-darkness

856 Posts

December 19 2017 22:45 GMT

#18608

I've recently studied common sorting algorithms. I've not bothered to learn how to reproduce them, but I'm wondering if just having an idea how they work is enough. Also, Big O notation as well. Are you guys the same?

phar

United States1080 Posts

December 19 2017 22:50 GMT

#18609

You should at least code up solutions for the main sorting algorithms yourself once, just to prove you can.

Who knows, you might end up interviewing at a place which asks it as a (crappy) interview question.

Deleted User 3420

24492 Posts

December 20 2017 22:40 GMT

#18610

edit: nevermind. found the bug. thats annoying. somehow a pair of ints had squirmed their way into what was supposed to be a list of arrays

graNite

Germany4434 Posts

December 21 2017 00:08 GMT

#18611

Im building a chess programm in python that i want to be able to also solve chess puzzles like this: + Show Spoiler +

Place two Knights, two Rooks, two Bishops and two Kings on a 4x4 chessboard, so that:

1) The Kings are not attacked at all.

2) All other pieces are attacked exactly once.

Ignore color, so every piece attacks every other piece whose square it can move to, including the Kings.

currently, my board looks like this:

 8  [r] [n] [b] [q] [k] [b] [n] [r] 
 7  [p] [p] [p] [p] [p] [p] [p] [p] 
 6  [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] 
 5  [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] 
 4  [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] 
 3  [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] 
 2  [P] [P] [P] [P] [P] [P] [P] [P] 
 1  [R] [N] [B] [Q] [K] [B] [N] [R] 
 #   A   B   C   D   E   F   G   H

I just print it to the output, but I dont like it really much. You cant tell what a black or white square is and using caps and lower case letters is also not that great. Do you guys maybe have a better idea of how to visualize the board in a better way without using third party libraries?

I tried the chess unicode characters and colorization in the console, but that doesnt work on windows.

Blisse

Canada3710 Posts

December 21 2017 04:52 GMT

#18612

I think Turtle is built into Python, not a third party libraries. Just import turtle.

https://docs.python.org/2/library/turtle.html

Manit0u

Poland17546 Posts

December 21 2017 16:22 GMT

#18613

https://www.pakyow.org/

Wow. I'll be definitely checking this thing out. It's a web framework that lets you do dynamic pages (angular-like) all in the back-end. Some of their solutions are pretty neat. Won't work for older browsers though, since it's all based on web sockets (I wonder how's performance with many dynamic properties in a view). The idea is really neat, I think it could be much better if Ruby were concurrent though.

Another thing I have to test is the phoenix framework since I already have to learn Elixir for work.

Neshapotamus

United States163 Posts

December 21 2017 17:37 GMT

#18614

On December 21 2017 09:08 graNite wrote:
Im building a chess programm in python that i want to be able to also solve chess puzzles like this: + Show Spoiler +

currently, my board looks like this:

 8  [r] [n] [b] [q] [k] [b] [n] [r] 
 7  [p] [p] [p] [p] [p] [p] [p] [p] 
 6  [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] 
 5  [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] 
 4  [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] 
 3  [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] 
 2  [P] [P] [P] [P] [P] [P] [P] [P] 
 1  [R] [N] [B] [Q] [K] [B] [N] [R] 
 #   A   B   C   D   E   F   G   H

Do you need to visualize in the console?

Easiest thing is to make HTML and view in the browser. Write some css and html and you will get everything you want.

8x8 table with height and width. CSS Style for black and white squares and borders.
Each piece would be an entry in the table. Style this with an img or a glyhicon.

If you want to go overboard. You might want to include a javascript file.

Write your output as json. Something along the lines of the position and piece and player.


[
{
     row: 1,
     col: 1,
     player: White,
     piece: Knight
},
{
     row: 2,
     col: 2,
     player: White,
     piece: King
}
...
]

Write some javascript to ingest the file.
Use that to dynamically update your board (HTML + CSS)

And if you really want to go overboard. You can make your game output the chess algebraic notation.
https://en.wikipedia.org/wiki/Algebraic_notation_(chess)

And you would write a parser.

graNite

Germany4434 Posts

December 21 2017 18:45 GMT

#18615

thats a good idea, although that would much more wore than i was planning to do :D

i wanted to use the console because that is the thing i have the easiest access to. i dont want to use external libraries because i want to do it "on my own"

TMG26

Portugal2017 Posts

December 21 2017 21:37 GMT

#18616

On December 22 2017 01:22 Manit0u wrote:
https://www.pakyow.org/

Wow. I'll be definitely checking this thing out. It's a web framework that lets you do dynamic pages (angular-like) all in the back-end. Some of their solutions are pretty neat. Won't work for older browsers though, since it's all based on web sockets (I wonder how's performance with many dynamic properties in a view). The idea is really neat, I think it could be much better if Ruby were concurrent though.

Another thing I have to test is the phoenix framework since I already have to learn Elixir for work.

Any reason for choosing elixir instead of erlang?

Manit0u

Poland17546 Posts

December 22 2017 12:19 GMT

#18617

On December 22 2017 06:37 TMG26 wrote:

Show nested quote +

Any reason for choosing elixir instead of erlang?

Rails is our primary technology stack. It'll be easier for people to move to Elixir than Erlang. We might move down the stack later but I hardly see a reason since Ruby has like the best syntax ever and it utilizes the Erlang VM anyway so it's more about how you write your code because it's compiled to Erlang code anyway.

Deleted User 3420

24492 Posts

December 22 2017 15:24 GMT

#18618

On December 21 2017 09:08 graNite wrote:
Im building a chess programm in python that i want to be able to also solve chess puzzles like this: + Show Spoiler +

currently, my board looks like this:

 8  [r] [n] [b] [q] [k] [b] [n] [r] 
 7  [p] [p] [p] [p] [p] [p] [p] [p] 
 6  [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] 
 5  [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] 
 4  [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] 
 3  [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] 
 2  [P] [P] [P] [P] [P] [P] [P] [P] 
 1  [R] [N] [B] [Q] [K] [B] [N] [R] 
 #   A   B   C   D   E   F   G   H

use jupyter notebook. it's pretty straightforward and easy. You can now use html and view through your browser.

and then, if you want even more:

https://pypi.python.org/pypi/python-chess

(you don't need to use all his code of course, since you want to do it yourself. you could just steal his board and pieces)

WarSame

Canada1950 Posts

December 24 2017 17:11 GMT

#18619

I've been working on Spring Boot. I've got OAuth2 working but my client secret is in my application.properties file. This will get added to github when I push. I could just .gitignore my application.properties file but there are other important values in there. How do I separate out my client secret/id from application.properties?

berated-

United States1134 Posts

December 24 2017 17:23 GMT

#18620

On December 25 2017 02:11 WarSame wrote:
I've been working on Spring Boot. I've got OAuth2 working but my client secret is in my application.properties file. This will get added to github when I push. I could just .gitignore my application.properties file but there are other important values in there. How do I separate out my client secret/id from application.properties?

Spring properties can be configured to read from multiple files. By default it also reads from system properties and environment variables. There are a lot of options for you, just have to figure out what works for you and what your deployment looks like.

One example of reading from multiple files

Spring boot guide

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