2,628 questions
0
votes
1
answer
79
views
Get duration of a video by swift API in macOS
I'm working for weeks to get the duration of a video file. I want to use direct api calls. I know, that I can use external command line tools to get it. But I want to avoid the dependencies with these ...
- 2,324
0
votes
0
answers
30
views
user-defined lazy mpmath constants
Can I define my own lazy mpmath constants, just like mpmath.pi and the others documented here?
In other words, can I define a constant whose value is an mpf or mpc computed
(or retrieved from memo ...
- 5,601
0
votes
0
answers
33
views
Does kusto support lazy-evaluation? Strategies to find an object that satisfies conditions across tables? (tables of different Kusto clusters)
(thanks in advance for any info 🙏)
I'm trying to find an objectId that satisfies 3 conditions across 3 different tables. These tables are in different Kusto clusters (if that matters). There are many ...
- 1,013
2
votes
1
answer
139
views
Lazily evaluating angular templates in primeng accordion tabs
I have a slightly expensive endpoint, which I want to get called only when it is actually required. For this question, I created a dummy service instead:
import { Injectable, Signal, signal } from '@...
- 4,430
0
votes
2
answers
248
views
Why does `foldl'` have the implicit reversal?
Recently to better understand the advantages and disadvantages of lazy evaluation, I check for some details of Haskell. I did that to do exercise 5.9 in SDF (Software Design for Flexibility)
More ...
- 772
0
votes
3
answers
114
views
What is the difference between being "short-circuiting" and being "lazy on the its second argument" for a binary function?
In the Examples section of foldr's documentation, I read that
Infinite structures
⚠️ Applying foldr to infinite structures usually doesn't terminate.
It may still terminate under one of the following ...
- 30.1k
3
votes
1
answer
84
views
How do let and case differ in terms of lazyness?
How do let and case differ in terms of lazyness? Where do I find the information myself? And how do I experiment with it in ghci?
Some context
This incomplete piece of code is an excerpt from
Parallel ...
- 30.1k
0
votes
0
answers
40
views
PySpark: `assert_unique` sometimes fails on first run, but passes on re-run without data changes
I'm using PySpark in a Jupyter Notebook and have a helper function that checks whether a column (or set of columns) has unique values:
def assert_unique(df: DataFrame, column_names: str | list[str]) -&...
3
votes
1
answer
98
views
force order of evaluation inside a tidypolars call
Is it possible in some way to force the evaluation order in a {tidypolars} pipe?
For example:
install.packages("tidypolars", repos = c("https://community.r-multiverse.org", '...
- 1,548
0
votes
1
answer
45
views
Why does Swift's lazy var solve the error: Cannot assign value of type '(HomeViewController) -> () -> HomeViewController' to type
Below code gives an error:
class HomeViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
let tableView = {
let t = UITableView(frame: .zero, style: .grouped)...
2
votes
0
answers
53
views
Lazy de-serialization of a JSON array as a Stream<T> [duplicate]
Consider I have a large (potentially infinite) array of JSON objects:
[
{
"id": 41,
"name": "foo"
},
{
"id": 42,
&...
- 5,460
4
votes
1
answer
101
views
Lazy evaluations for DataFrames
Let me provide quick demo which shows that second approach is 10x times slower than the first one.
import pandas as pd
from timeit import default_timer as timer
r = range(1,int(1e7))
df = pd....
- 653
5
votes
1
answer
124
views
Trouble with understanding std::views::filter -> Lazy Evaluation
auto ResultView
{
std::views::iota(1,30)
| std::views::take(20)
| std::views::filter([](int x){ return x%2!=0; })
};
std::cout<<...
- 93
0
votes
3
answers
110
views
Why does this haskell program have incorrect time complexity?
newtype Prob a = Prob { getProb :: [(a,Rational)] } deriving (Show,Eq,Functor)
flatten :: Prob (Prob a) -> Prob a
flatten (Prob xs) = Prob $ concat $ map multAll xs
where multAll (Prob innerxs,...
- 359
1
vote
2
answers
1k
views
How should one migrate from lazy_static to std LazyLock/LazyCell
I created a library that uses lazy_static to create a static HashMap that other parts of the code can reference to look up values like this:
use lazy_static::lazy_static;
use std::collections::HashMap;...
- 2,461