Questions tagged [constants]
The constants tag has no usage guidance.
21
questions
1
vote
2
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152
views
How to deal with constants that are shared between multiple packages?
I'm looking at creating my first packages to clean up my codebase.
Below is a very simplified version of my current project structure:
my_project/
|-database.py
|-app_1.py
|-app_2.py
|-constants.py
...
- 301
2
votes
2
answers
229
views
What is the best way to keep some constant complex data structures in a C++ code?
As implied by the title of the Q, I have a few entities and need to keep them as constant objects in a C++ project. Each entity contains very complex data structures (lists of enums, maps of maps, etc....
- 211
0
votes
1
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55
views
Term for a map of constants [closed]
Considering there's a map of string constants, most commonly with a key and a value being equal, e.g. in TypeScript:
const itemTypes = {
FOO_BAR: 'FOO_BAR',
BAZ_QUX: 'BAZ_QUX',
} as const;
They ...
- 175
3
votes
3
answers
866
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Define "constants" at the global or function scope?
I often define variables that will never change, i.e. constants, at the top of a script/module. But recently I've been wondering if it makes sense to define them at the function scope level if they ...
- 1,047
142
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3
answers
25k
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Where do "magic" hashing constants like 0x9e3779b9 and 0x9e3779b1 come from?
In code dealing with hash tables, I often find the constant 0x9e3779b9 or sometimes 0x9e3779b1. For example
hash = n * 0x9e3779b1 >>> 24
Why is this particular value used?
- 1,003
0
votes
1
answer
156
views
Visibility of constants
Should constants of my class only be public if I know that they will be used from their users or doesn't it hurt to make all of my constants public per se?
Is not exposing all constants cleaner?
- 119
1
vote
1
answer
428
views
Should I use accessors or public static fields for global constants?
I have to work on some code that was CAST-audited. The report says that it is bad in Java to use public static and that accessors should be preferred. That is also what I was taught at school.
The ...
- 163
4
votes
4
answers
656
views
Is a constant name related to its current value an anti-pattern? [closed]
For example, suppose I have a string constant like this:
const TITLEBAR_MESSAGE="Welcome back, %USERNAME%!";
I think it is more readable when it is named as
const WELCOME_BACK_USERNAME="Welcome ...
- 5,652
0
votes
2
answers
357
views
Referencing Database Primary Keys from Codebase
I don't have a lot of experience with these kind of issues, but I feel I need to consult on this issue. The current codebase I'm working on is using what I consider to be a questionable technique to ...
- 109
3
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5
answers
766
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I feel like these constants should be in a different class?
I have a static class called RenderingUtilities that houses several useful methods and constants. Some of these constants are related to the Earth as an object such as the Earth's radius. I believe ...
- 1,165
3
votes
1
answer
106
views
Should I replace a constant with static methods, if that constant usually 'cooperate' with a specific operator?
For example, to convert between g and kg, I have a constant 1000:
public static final float G_TO_KG=1000;
.
.
.
this.result = someResult*1000;
I found G_TO_KG always bind to operator '*'. So my ...
- 5,652
2
votes
3
answers
185
views
When defining constants, which is more important? Easier to find? Or narrower scope?
For example, consider I have constants VOL_MIN and VOL_MAX, which is used inside 1 function only:
public void setVolume(int val){
final int VOL_MIN = 1;
final int VOL_MAX = 10;
val=Math....
- 5,652
1
vote
1
answer
208
views
Should I make constant for values of three choices (trivalent/ternary)?
For two choices there is boolean. In my case, I have positive, negative, and neutral which are three choices and cannot be represented by boolean. I've see there's method Math.signum(x) in Java which ...
- 154
0
votes
1
answer
4k
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Is it a good practice to store constants in configuration files [duplicate]
In my project I have some constants where I reference almost everywhere:
public sealed class Constants{
public static readonly int MAX_QUAL { get; } = 1080;
public static readonly bool CC { ...
- 113
3
votes
1
answer
132
views
Should I avoid creating a variable with shorter name for a constant?
suppose I have code like this
someFunction:function(userId){
var url=SomeClass.SomeNetworkConnector.SOME_URL;
if(url !== undefined && userId !== undefined){
this.openURL(url+"?userid="...
- 5,652
28
votes
7
answers
11k
views
May a value of a constant be changed over time?
During development phase, there are certain variables which need to be the fixed in the same run, but may need be modified over time. For example a boolean to signal debug mode, so we do things in the ...
- 407
3
votes
1
answer
313
views
Should I rename variables that are already constants in my own library?
I'm writing a high level wrapper around the Python socket.socket object. Specifically, I want to do this for IPv4 TCP sockets (though it would be useful to be able to expand the library later with ...
- 149
6
votes
1
answer
28k
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Is it bad practice to define constants using class static methods?
Instead of using #define or const, I usually define constants using class static methods as follows:
//AppConstants.h
#include <string>
class AppConstants{
public:
static int getMax();
...
- 5,725
3
votes
4
answers
553
views
Should I use one class for one constant?
Originally, in most languages, I would like to put constants into a class like that:
public class AppConstants{
public static final double HEIGHT_MAX=20.0;
public static final int COUNT_MAX=...
- 5,725
35
votes
1
answer
27k
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Original source of `(seed * 9301 + 49297) % 233280` random algorithm?
If you search for examples of creating a seeded (pseudo)Random number generator, you will run into stuff like this (specific example http://indiegamr.com/generate-repeatable-random-numbers-in-js/):
//...
- 511
49
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7
answers
45k
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Is it a bad practice to have an interface to define constants?
I am writing a set of junit test classes in Java.
There are several constants, for example strings that I will need in different test classes.
I am thinking about an interface that defines them and ...
- 932