patterns | A catalogue of Rust design patterns , anti-patterns | Architecture library
kandi X-RAY | patterns Summary
kandi X-RAY | patterns Summary
An open source book about design patterns and idioms in the Rust programming language that you can read here.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of patterns
patterns Key Features
patterns Examples and Code Snippets
public static int[] KnuthMorrisPrattShift(char[] pattern) {
int patternSize = pattern.length;
int[] shift = new int[patternSize];
shift[0] = 1;
int i = 1, j = 0;
while ((i + j) < patternSize) {
public int numberOfPatterns(int m, int n) {
//initialize a 10x10 matrix
int skip[][] = new int[10][10];
//initialize indices of skip matrix (all other indices in matrix are 0 by default)
skip[1][3] = skip[3][1
private String maskMessage(String message) {
if (multilinePattern == null) {
return message;
}
StringBuilder sb = new StringBuilder(message);
Matcher matcher = multilinePattern.matcher(sb);
while (m
Community Discussions
Trending Discussions on patterns
QUESTION
I would like to introspect the tail end of a method call from the callee side.
Right now I am doing this explicitly...
...ANSWER
Answered 2022-Mar-29 at 21:11Per @jonathans comment, the raku docs state:
A method with the special name FALLBACK will be called when other means to resolve the name produce no result. The first argument holds the name and all following arguments are forwarded from the original call. Multi methods and sub-signatures are supported.
QUESTION
It seems that JDK 8 and JDK 13 have different floating points.
I get on JDK 8, using Math:
ANSWER
Answered 2022-Mar-20 at 18:16This seems to be caused by a JVM intrinsic function for Math.cos
, which is described in the related issue JDK-8242461. The behavior experienced there is not considered an issue:
The returned results reported in this bug are indeed adjacent floating-point values [this is the case here as well]
[...]
Therefore, while it is possible one or the other of the returned values is outside of the accuracy bounds, just have different return values for Math.cos is not in and of itself evidence of a problem.
For reproducible results, use the StrictMath.cos instead.
And indeed, disabling the intrinsics using -XX:+UnlockDiagnosticVMOptions -XX:DisableIntrinsic=_dcos
(as proposed in the linked issue), causes Math.cos
to have the same (expected) result as StrictMath.cos
.
So it appears the behavior you are seeing here is most likely compliant with the Math
documentation as well.
QUESTION
I have an array of positive integers. For example:
...ANSWER
Answered 2022-Feb-27 at 22:44This problem has a fun O(n) solution.
If you draw a graph of cumulative sum vs index, then:
The average value in the subarray between any two indexes is the slope of the line between those points on the graph.
The first highest-average-prefix will end at the point that makes the highest angle from 0. The next highest-average-prefix must then have a smaller average, and it will end at the point that makes the highest angle from the first ending. Continuing to the end of the array, we find that...
These segments of highest average are exactly the segments in the upper convex hull of the cumulative sum graph.
Find these segments using the monotone chain algorithm. Since the points are already sorted, it takes O(n) time.
QUESTION
I'm developing an API with Spring Boot and currently, I'm thinking about how to handle error messages in an easily internationalizable way. My goals are as follows:
- Define error messages in resource files/bundles
- Connect constraint annotation with error messages (e.g.,
@Length
) in a declarative fashion - Error messages contain placeholders, such as
{min}
, that are replaced by the corresponding value from the annotation, if available, e.g.,@Length(min = 5, message = msg)
would result in something likemsg.replace("{min}", annotation.min()).replace("{max}", annotation.max())
. - The JSON property path is also available as a placeholder and automatically inserted into the error message when a validation error occurs.
- A solution outside of an error handler is preferred, i.e., when the exceptions arrive in the error handler, they already contain the desired error messages.
- Error messages from a resource bundle are automatically registered as constants in Java.
Currently, I customized the methodArgumentNotValidHandler
of my error handler class to read ObjectError
s from e.getBindingResult().getAllErrors()
and then try to extract their arguments and error codes to decide which error message to choose from my resource bundle and format it accordingly. A rough sketch of my code looks as follows:
Input:
...ANSWER
Answered 2022-Feb-03 at 10:12If I understood your question correctly....
Below is example of exception handling in better way
Microsoft Graph API - ERROR response - Example :
QUESTION
I'm currently building PoC Apache Beam pipeline in GCP Dataflow. In this case, I want to create streaming pipeline with main input from PubSub and side input from BigQuery and store processed data back to BigQuery.
Side pipeline code
...ANSWER
Answered 2022-Jan-12 at 13:12Here you have a working example:
QUESTION
I'm build Django app, and it's work fine on my machine, but when I run inside docker container it's rest framework keep crashing, but when I comment any connection with rest framework it's work fine.
- My machine: Kali Linux 2021.3
- docker machine: Raspberry Pi 4 4gb
- docker container image: python:rc-alpine3.14
- python version on my machine: Python 3.9.7
- python version on container: Python 3.10.0rc2
error output:
...ANSWER
Answered 2022-Jan-07 at 19:13You can downgrade your Python version. That should solve your problem; if not, use collections.abc.Mapping
instead of the deprecated collections.Mapping
.
Refer here: Link
QUESTION
I would like to divide a single owned array into two owned halves—two separate arrays, not slices of the original array. The respective sizes are compile time constants. Is there a way to do that without copying/cloning the elements?
...ANSWER
Answered 2022-Jan-04 at 21:40use std::convert::TryInto;
let raw = [0u8; 1024 * 1024];
let a = u128::from_be_bytes(raw[..16].try_into().unwrap()); // Take the first 16 bytes
let b = u64::from_le_bytes(raw[16..24].try_into().unwrap()); // Take the next 8 bytes
QUESTION
So far, I've seen two builder patterns in official Rust code and other crates:
...ANSWER
Answered 2021-Dec-19 at 02:26Is it beneficial to build multiple values from the same builder?
- If yes, use
&mut self
- If no, use
self
Consider std::thread::Builder
which is a builder for std::thread::Thread
. It uses Option
fields internally to configure how to build the thread:
QUESTION
I have downloaded the street abbreviations from USPS. Here is the data:
...ANSWER
Answered 2021-Nov-03 at 10:26Here is the benchmarking for the existing to OP's question (borrow test data from @Marek Fiołka but with n <- 10000
)
QUESTION
PEP 622, Literal Patterns says the following:
Note that because equality (__eq__) is used, and the equivalency between Booleans and the integers 0 and 1, there is no practical difference between the following two:
...
ANSWER
Answered 2021-Oct-14 at 22:06Looking at the pattern matching specification, this falls under a "literal pattern":
A literal pattern succeeds if the subject value compares equal to the value expressed by the literal, using the following comparisons rules:
- Numbers and strings are compared using the == operator.
- The singleton literals None, True and False are compared using the is operator.
So when the pattern is:
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