p-iteration | make array iteration easy when using async | Reactive Programming library
kandi X-RAY | p-iteration Summary
kandi X-RAY | p-iteration Summary
Utilities that make array iteration easy when using async/await or Promises
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QUESTION
I have a data frame with 400 rows, each corresponding to a fishing area. Each row includes the coordinates of vertices of said fishing area, like this (NW = northwest corner, etc.):
...ANSWER
Answered 2021-Apr-08 at 14:03Here is a first go at it. Not sure if I accidently switches X and Y, so please (visually) check output
QUESTION
I have the code below that runs fine when run in a standalone file. But when I try to use it in my API endpoint and send a request with the postman, it can't seem to work.
I can't understand why. I also have the same issue when trying to write an excel file with the same API endpoint. If I specify a path, it won't find it. If I just use the filename, it will write fine in the current directory.
What am I missing? the code below is from when I use it in a standalone file. If I use it inside this route below, it won't work.
...ANSWER
Answered 2021-Feb-02 at 13:09You are await
ing readDir, but you are also giving it a callback function. You can't both await
a Promise and also give it a callback. For that matter, Promises don't take a callback as argument at all.
Also you are writing async
everywhere, this is useless for functions that don't await anything inside.
QUESTION
I would like to write some code in a "functional programming" style.
However, I start with an Iterator of Results and I only want to apply the function to the Ok
items. Furthermore, I want to stop the iteration on the first error (however, I'd be open to different behavior).
So far, I am using a nested map()
pattern: .map(|l| l.map(replace))
. I think this is extremely ugly.
Using the nightly "result_flattening", I can flatten each nested Result, E>
into a Result
. Using eyre::Context
I convert the different Error types into an eyre::Report
error type. All of this feels quite clumsy.
What is an elegant way to write this in Rust?
Minimal Working Example ...ANSWER
Answered 2020-Dec-05 at 20:12Since you discard the error type anyway, you can avoid eyre
entirely and use .ok
to convert the Result
into an Option
, then just work with Option
's and_then
to avoid flattening every time:
QUESTION
i am trying to make ajax call with model reveal in my application.
able to pass dynamic id in url but it reveals only last model (without ajax-call) on each click
i tried previous solution with ajax-all Reveal Modal is revealing last value in loop iteration Foundation-zurb issue
but i am not able to pass dynamic id in javasript file.
model reveal reference link:- https://codepen.io/sujayjaju/pen/akAYzP?editors=1010
current code reveals one model on each reveal click i tried last solution as well(url mentioned) but it doesn't worked with ajax-call.
application.js
...ANSWER
Answered 2020-Aug-12 at 11:53You can refer this particular commit from my application which is well.
Javascript Code
QUESTION
Following scenario:
I have a application, which runs for weeks and then i want to shut it down gracefully.
The following code do the trick:
...ANSWER
Answered 2019-Dec-18 at 09:44Your assumption that a volatile read always hits main memory doesn't hold for cache-coherent systems. The volatile read should hit L1 until the other thread modifies the flag and invalidates the cacheline upon which the variable resides.
However, volatile reads establish a happens-before relation with subsequent accesses, so this prevents the compiler and CPU from performing certain latency-hiding tricks. Instead, use opaque access mode to lessen the impact (thanks Holger :)).
Something like this should be fast, though I'll leave the benchmarking up to you:
QUESTION
I'm trying to override some object properties based on the properties of a parameter object.
This code does almost what I want it to do:
...ANSWER
Answered 2019-Oct-10 at 22:01The problem is with the closures; easiest way to fix is with let
instead of var
QUESTION
element with given number on each iteration?
This might seem insanely basic. But I'm struggling with this simple creation of an for-loop since no p
Element is created on any loop-iteration. I don't know how to display the newly created p
Element in my div
Element (.output).
It should create an p
element to my div
on each iteration, showing the current value of i
. When it's 10, it should say something like "Countdown has started" and at the end "Countdown Ended!". Here is a small sample (rest of html omitted):
ANSWER
Answered 2019-Sep-25 at 14:14Since you're looping from 10
to 0
, the loop condition should be i >= 0
:
QUESTION
I'd like to remove the use of .unwrap()
from code which maps over an ndarray::Array
and use a Result
type for get_data()
instead.
ANSWER
Answered 2019-Sep-04 at 12:16A native try_map
implementation from ndarray
would be ideal. It can short-circuit the computation and return as soon as an error occurs. It is also more composable.
Short of that, nothing wrong with a good old mutable sentinel variable:
QUESTION
I solve CodeWars challenge: `Write function find_average which calculates the average of numbers in a given array. But the questions is:
1) How can this code be optimized in Big-O notation terms, is it possible to reduce loop-iterations: input values testing with array.every (need to exclude TypeError when array.reduce with [1, 2, 'string'])
2) I think now complexity equal to Θ(n), am I right?
...ANSWER
Answered 2019-Aug-16 at 07:34There's no need to iterate twice, once to check if every element is a number, and once to add them all up. Rather, you can just iterate once, and if any element is not a number, throw immediately:
QUESTION
Say I have:
...ANSWER
Answered 2018-Jul-18 at 09:54Did a little benchmark with the following code on node.js 8.11
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