Questions tagged [lambda]
Lambdas are anonymous functions (i.e. not having an identifier, like methods in a class) which can be used in a wide range of programming languages.
92 questions
2
votes
2
answers
322
views
Why does a Java lambda need to explicitly mention the method of the functional interface?
import java.util.function.Function;
public interface Printable {
public String print(String s);
public static void main(String[] args) {
Function<String, String> fn = p -> p +...
- 539
0
votes
1
answer
171
views
How can I minimize the number of captured variables in lambda expressions? [closed]
If a lambda is frequently used, it is considered to reuse the same instance instead of creating new instances repeatedly.
How can I minimize the number of captured variables in lambda expressions?
- 1
-2
votes
2
answers
241
views
Quiz Site Software Architecture Question
I am currently writing an application that is going to be an adaptive quiz-like site for studying. The idea is a user is studying some topic and they are given questions on the site and enter their ...
- 11
-1
votes
2
answers
155
views
Architecture for EOD (end of day) stock exchange prices
I need to work out the architecture for a NASDAQ frontend charting application (a desktop app in .Net). Note that this is NOT for real-time quotes.
NASDAQ provides an api that gives historical pricing,...
- 117
0
votes
0
answers
91
views
Lambdas vs scope blocks for encapsulation in c++
When working with functions that run a few short "procedures" in sequence that are not used anywhere else and it makes sense to keep it all inline, in a single function, a large part of the ...
- 129
1
vote
3
answers
212
views
Ensuring run-once behavior in a multi-threaded environment via volatile lambdas?
I'm coding an enum strategy pattern where one of the strategies makes use of an ScheduledExecutor:
class ControllerImpl {
//...
boolean applyStrat(StratParam param) {
getStrat().apply(...
- 355
1
vote
1
answer
779
views
Is using lambdas and overload resolution a recommended way to write a visitor for a variant?
If I have a discriminated union and want to write a function piecewise, the following code works just fine, but is taking advantage of some fairly tricky (at least to me) stuff involving overload ...
- 351
24
votes
8
answers
7k
views
Is using lambdas to express intent not pythonic?
PEP 8 states the following about using anonymous functions (lambdas)
Always use a def statement instead of an assignment statement that
binds a lambda expression directly to an identifier:
# Correct: ...
- 351
1
vote
0
answers
64
views
Designing an architecture for running multiple scripts
Our company is an aggregator of multiple payment services fragmented on the web. So instead of businesses integrating multiple services one by one, they will only need to integrate to our API, and we ...
2
votes
1
answer
169
views
Resolving lambdas that depend on each other
In the C++20 codebase that I work there are a couple of functions which have helper functions defined as lambdas. I can see the idea of locality for these helpers. By having them there in the function,...
- 923
9
votes
5
answers
835
views
Re-architecting CPU intensive Node application to handle multiple users
A few years ago, I wrote an application that allowed users to upload a file (it's a very specific file type) to a server. It then sends instructions to the server on how to visualise the data, and the ...
- 79
0
votes
0
answers
765
views
How to implement a debounce buffer system on AWS?
I'll describe my case:
I have an aws lambda that will expose an API interface that will return json data (by topic) which is cached.
This lambda will also offer private endpoints to recalculate the ...
- 513
0
votes
1
answer
1k
views
Capture by value/reference and early/late binding
Is capture by value (x below) an early binding and capture by reference (y below) a late binding in C++ lambdas, or are they both early bindings—the first by value and the second by reference?
#...
- 612
0
votes
1
answer
360
views
Reading from SQS using AWS Lambda vs WebApp background worker
I'm writing a microservice (in .netcore) that will handle some requests using WebAPI, but also it needs to react to some external events. I see 2 possibilities how to solve it (on a very high level):
...
1
vote
2
answers
624
views
How do the SOLID principles apply in the context of Lambdas and Streams? [duplicate]
How are these principles applied in the context of streams and lambda expressions? In particular, the applicability with respect to the following three principles: - Single Responsibility Principle (...
- 133