All Questions
77,560
questions
3
votes
0
answers
49
views
React and D3 Alignment Histogram
I'm reasonably new to D3, and I've put together a class based React component which outputs a genomic alignment visually. The ...
- 332
1
vote
2
answers
64
views
Django: App based at PolymorphicModel
I'm building a simple Django app for reviews of different objects (restaurants, car services, car wash etc).
I started with the app, but soon I faced first problem. Every object has features (but ...
- 145
1
vote
1
answer
45
views
query optimization and indexing
database relations can be found here http://www.tpc.org/tpc_documents_current_versions/pdf/tpc-h_v2.18.0.pdf
...
- 11
3
votes
0
answers
124
views
Create one class to perform all type orm functionalities
I'm trying to create a separate package in a monorepo to handle TypeORM functions. So if I have two APIs (User API, Admin API), both can refer to the same package ...
- 81
34
votes
3
answers
14k
views
Match blood types in C
I have written a solution to the blood-type matching problem, as described at https://projectlovelace.net/problems/blood-types/. The problem is to determine whether a given recipient (in this case, <...
- 457
4
votes
1
answer
89
views
Properly read integer in a range in C
I wanted to write a C function C99/POSIX compliant that read an integer from the user input. I wanted this function to be safe and robust but I feel it is way too complex for such simple task.
I am ...
- 1,099
2
votes
0
answers
316
views
socket.io / jwt [closed]
I am studying socket.io and ended up making a connection using react as front end
js and how to back end node js
I was successful but I have a question as to how I made my code I don't know if it's "...
- 209
1
vote
1
answer
118
views
Returning search results based off checkboxes
I use the following code to filter data from SQL and it works fine. However, below code is vulnerable to SQL injection, but all the ...
- 153
5
votes
1
answer
2k
views
Mapping Excel rows to model
I have an Excel file and each row within the sheet represents an employee's data.
I am trying to find a cleaner way to map each row to a model object:
...
- 361
2
votes
1
answer
623
views
Tic-Tac-Toe with changeable board size (Part 2)
Part 1: Tic-Tac-Toe with changeable board size (Part 1)
I just revisited all my previous questions and saw that I hadn't updated my Tic-Tac-Toe code. So, I improvised my code as per @Austin Hastings ...
- 2,730
4
votes
2
answers
2k
views
Alternative code to classes in Javascript?
I'm new to JavaScript and came across classes in ES6. Though they are great, I don't want to learn something that can be done in other ways. So, I created this code that does somehow similar job to ...
- 41
3
votes
1
answer
118
views
Linked List implementation in python 3.x
I took this as a challenge and implemented linked list data structure in python
...
- 2,730
1
vote
1
answer
716
views
Password hashing (PBKDF2) and RSA encrypt + AES 256 in Java
Here's what I could comprehend in C code:
Generates a key using PBKDF2
Generates an IV which is MD5 of PBKDF2 key in step #1
Does AES-256 encryption on customer-id - which is one of the output
RSA ...
- 19
4
votes
2
answers
464
views
Run length encoder decoder
The code works not only as a normal run length encoder and decoder, but it also works for values like 3ABC (Prints ABCABCABC), ...
- 2,730
3
votes
2
answers
208
views
5
votes
2
answers
671
views
Scrabble Scorer in Python
I made this Scrabble with care since it will be mainly used by family that will not understand the error codes so that is why I catch basically every possible error, to make it user friendly. I have ...
- 307
4
votes
2
answers
97
views
Python Friendly Form
The 'friendly form' of a number is written as a sum of reciprocals of distinct positive integers. eg. $$\frac{4}{5} = \frac{1}{2} + \frac{1}{4} +\frac{1}{20}$$
I have written a python program that ...
- 181
2
votes
1
answer
56
views
Python - Automate code involving suffix [closed]
I am trying to automate this portion of code in python (code shown for 2 polygons, I am trying to do the same for 10 000 polygons). Any ideas on how to implement this using ...
- 29
10
votes
2
answers
197
views
System design - Jaipur board game learning agent
Link to my previous question.
I've implemented the other features of the board game, and made a simple learning method that stores state values and makes optimal moves based on that.
I've used some ...
3
votes
0
answers
192
views
Rust 2D grid class
This is the first time I‘ve used Rust, and I'd like to have some feedback on this project. The Grid class should be able to store objects of any type; it's a simple ...
- 786
10
votes
1
answer
424
views
Resizable containers with VueJS
A month ago I reviewed the code in Resizable split DIVs Vue.js, suggesting that the OP use computed properties and bound styles to simplify the code (at least reducing the need to use ...
- 27.6k
2
votes
1
answer
163
views
How to properly write code for Java Swing
basically I'm learning Java Swing by myself and I'm wondering what is the correct way to wrote code for it?
I don't want to have a big class with everything in it and I want to do in the most "correct"...
- 21
4
votes
1
answer
139
views
Save points cloud in PLOT3D format
I have the following function to save points cloud in PLOT3D format:
...
- 145
6
votes
1
answer
2k
views
Recursively listing the content of an FTP server
Today I found myself in need of programmatically getting a recursive list of the files on a remote FTP server to look for some data archives. Much to my surprise, I could not find this functionality ...
- 7,250
4
votes
1
answer
221
views
Code to fetch BitBucket repos
This actually works nicely (we have > 2k repos) but I would really like it to start producing results right away as soon as it has any. Mostly so it seems faster than it is (by being more responsive).
...
4
votes
0
answers
78
views
Extracting cycles from directed graph with max degree 1 and then performing set cover on cycles
I'm trying to solve P1243E in an efficient manner. The problem in simple words is:
Given \$k\$ boxes, \$i\$-th box with \$n_i\$ numbers. All numbers are distinct. We need to select one number from ...
- 1,456
13
votes
3
answers
2k
views
Hough transform algorithm - Idiomatic c++
I've got some working code to compute the Hough transform for circles:
...
- 1,041
1
vote
2
answers
852
views
String to Integer (atoi)
I was doing following question on leetcode: String to Integer (atoi)
Question:
Implement atoi which converts a string to an integer.
The function first discards as many whitespace characters ...
- 495
9
votes
3
answers
1k
views
Counting without zeroes
Below is a python script that generates the sequence ['a', 'b' .. 'z', 'aa', 'ab' .. 'az', 'ba', 'bb' .. 'zz', 'aaa', 'aab', ..]
This is essentially counting in ...
- 243
7
votes
3
answers
4k
views
Parsing molecular formula
Is it possible to improve this code in terms of efficiency / line number ? (avoid nested code ...). It comes from a test I failed. I don't know how I could have done it better.
...
- 89
5
votes
1
answer
373
views
Roman Number to Integer
Problem Definition
Roman numerals are represented by seven different symbols: I, V, X, <...
- 3,490
0
votes
1
answer
36
views
Correctness and Performance of graph plotting on R
Current State:
I have two CSV files, their sample attached below:
FileOutputWithoutBuffer-Metrics.csv
...
- 103
2
votes
1
answer
1k
views
Quadratic "Complete the Square" Solver in Python 3
I quickly wrote this program to transform quadratic expressions in general form into vertex form.
\$ax^2 + bx + c \;=\; a(x-h)^2 + k,\quad\text{where}\quad h = -\frac{b}{2a} \quad\text{and}\quad k = ...
- 43
7
votes
1
answer
376
views
Hill Climbing Egg Holder function - escaping local extrema
Here is the Egg Holder function for \$m\$ dimensions:
$$\displaystyle f(x)=\sum_{i=1}^{m-1}\left[-(x_{i+1}+47)\sin\sqrt{|x_{i+1}+x_i /2 + 47|} -x_i \sin\sqrt{|x_i - (x_{i+1}+47)|}\right]$$
I am ...
- 455
2
votes
1
answer
166
views
User authentication, management
I have recently started studying JavaScript, nodeJS, and reactJS on the front-end, and I have some questions about best practices to apply in this JavaScript world. I would like to ask for opinions ...
- 209
1
vote
0
answers
63
views
Function that provides callback for promise or non-promise
Below I created a use function that wraps a promise or non-promise, providing the a value callback all-while preserving the original function type.
...
- 721
4
votes
1
answer
1k
views
Better way than setInterval to wait for an image load?
This is really a simple affair, I just wonder if there is a better way to do it:
...
- 253
5
votes
1
answer
50
views
Adding users for login
I have some questions about best practices to apply in JavaScript. I would like to ask about my code and how I could improve.
Starting with an example, I have 2 functions with different ways of ...
- 209
3
votes
2
answers
2k
views
Validate if either or both of two fields has been provided, as a ValidationAttribute
I have a binding model where at least one of two fields must be specified. I can't just set them both as [Required]. Here is what I came up with:
...
- 806
6
votes
1
answer
155
views
Spread values to an object (Computed property names)
I would like to get a review of something,
I have a function that creates an array of objects for a Drop-Down component (react-select).
The function gets data, <...
- 161
5
votes
1
answer
343
views
Writing a BitTorrent client in JavaScript
I'm trying to write a JavaScript BitTorrent client in Node.js to get more familiar with the language and ecosystem. I don't know how often people use classes in JavaScript since I feel like the ...
- 81
5
votes
1
answer
111
views
Compiling Go with python
I've made a small script to compile Go code with Python.
The result is not something I'm happy with, because:
It seems overly complicated
I'm worried the nested if-else with f string are unreadable
...
- 11.5k
2
votes
1
answer
491
views
Number of unique substrings of particular length of a binary string
Question: A binary string is given with only 0's and 1's. A number n is also given as the length of a sub string to be considered. It is to find the number of unique substrings. Here, n=3.
My ...
- 313
2
votes
0
answers
110
views
Property typed lodash compose function
Here I created a typed version of lodash flow that offers more specific typing.
I'm curious if this exists in any other library, which optimized in tying any way —...
- 721
4
votes
1
answer
700
views
Iterate through Expression Tree
I'm trying to build an iterator (enumerator) that can select specific elements in an Expression tree by traversing the tree and deferring further iteration until ...
- 141
-3
votes
2
answers
95
views
Which is faster, (n==0 or n==1) or (n*(n-1)==0) [closed]
This is the first time for me to ask a question in this site. Recently, I was learning python 3.x and I got a question...
Which is faster ?
if n==0 or n==1:
or
...
- 113
1
vote
1
answer
52
views
How to check list of environment variable in python? [closed]
I have requirement to check list of environment variable in Linux. Based on environment variable, exit code will be different. how to optimize the below code?
...
- 165
2
votes
1
answer
53
views
Reporting progress using a Follower
My goal is to implement a function that accepts a Follower object that will be used to report progress through a complex function (a depth-first traversal of a ...
- 121
5
votes
1
answer
262
views
Turtle controller with simple instruction set
I've made a controller for Python's Turtle. The controller essentially defines an 'instruction set' so that commands can be recorded in a text file and then executed sequentially by the turtle. It ...
- 163
3
votes
0
answers
40
views
Retrieving Registry nodes for HKLM
I am using the below code to retrieve nodes and values. It is taking 20 mins to retrieve the nodes and values of HKLM.
I'm expecting to reduce the retrieving time
...
- 51