I have an arrow function that looks like this (simplified): const f = arg => { arg.toUpperCase(); }; But when I call it, I get undefined: console.log(f(“testing”)); // undefined Why? Example: const f = arg => { arg.toUpperCase(); }; console.log(f(“testing”)); (Note: This is meant to be a clean, canonical dupetarget for the specific issue with … Read more
I have a button with which I start a test function: <button type=”button” onClick={startTestFrequencyList}>{ frequenciesTestRunning ? ‘Stop Test Frequency’ : ‘Start Test Frequency’ }</button> The startTestFrequencyList either starts the testFrequencyList or stops it. const [stopTest, setStopTest] = useState(false); const [frequenciesTestRunning, setFrequenciesTestRunning] = useState(false); const startTestFrequencyList = () => { if (frequenciesTestRunning) { window.alert(“Already testing”) setStopTest(true); … Read more
How to find the rank of a kdb function through program for test validation. For example -> func: {x+y*10} / rank 2 For func function the rank is 2 however how to identify if the rank is low i.e < 2 or >2 and throw error through program for validation check? Please suggest how to … Read more
I am trying to optimize my query which runs on Postgresql version 13 or 14. Let’s say we have table with corresponding index: CREATE TABLE journal ( account_id TEXT NOT NULL, event_at TEXT NOT NULL, id INTEGER PRIMARY KEY ); CREATE INDEX journal_account_id_event_at_id_idx ON journal (account_id, event_at, id); INSERT INTO journal VALUES (‘A’, ‘2023-01-01’, 1); … Read more
I am a beginner and I have this Error saying [error: spawn C:\WINDOWS\system32\cmd.exe ENOENT] can anybody fix it? also, I want to know whether the error is serious or not. Error ScreenShot I tried to uninstall the program, and reinstall it but did not work.
The Delivery table has got more than 4 million rows. I used MySQL database. async adminDeliveriesViewCount (data) { try { const batchSize = 10; let batchIndex = 0, totalDeliveries = 0; while(true) { let total = await Delivery.createQueryBuilder().skip(batchIndex * batchSize).take(batchSize) .getCount(); if(total == 0) break; totalDeliveries += total; ++ batchIndex; } return totalDeliveries; } catch … Read more
I am using Exoplayer to play some m3u8 files. But some of the files are getting played and some can not be played. But the MX Player / VLC player played all the files successfully. This is how I am playing the stream :- player = new ExoPlayer.Builder(this).build(); playerView.setPlayer(player); playerView.setShowNextButton(false); playerView.setShowPreviousButton(false); playerView.setKeepScreenOn(true); MediaItem mediaItem = … Read more
when i use send keys to upload a file to an input element i get the file not found error. the code worked completely fine on my local mac but only on the google cloud windows 10 2019 vm im facing this issue. this is the full error i get: ` Traceback (most recent call … Read more
In the Bigtable paper, Google explains page 4 : “Bigtable relies on a highly-available and persistent distributed lock service called Chubby”. They also say they developped it in-house, based on the Paxos algorithm. I find these precisions strange, because the entirety of Bigtable should be highly-available, persistent and distributed, not just the locks. But the … Read more
I understand that strings in C are just character arrays. So I tried the following code, but it gives strange results, such as garbage output or program crashes: #include <stdio.h> int main (void) { char str [5] = “hello”; puts(str); } Why doesn’t this work? It compiles cleanly with gcc -std=c17 -pedantic-errors -Wall -Wextra. Note: … Read more