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How do I test for an empty JavaScript object?
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ECMA 5+:
// because Object.keys(new Date()).length === 0;
// we have to do some additional check
Object.keys(obj).length === 0 && obj.constructor === Object
Note, though, that this creates an unnecessary array (the return value of keys).
Pre-ECMA 5:
function isEmpty(obj) {
for(var p...
How do I install cURL on cygwin?
...ries for your Cygwin program files and your Local Package directory so you don't loose previous installed packages. When something can go wrong, it will = Not simple
– Salvador Valencia
Feb 1 '17 at 19:45
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How do you save/store objects in SharedPreferences on Android?
...ou can use gson.jar to store class objects into SharedPreferences.
You can download this jar from google-gson
Or add the GSON dependency in your Gradle file:
implementation 'com.google.code.gson:gson:2.8.5'
Creating a shared preference:
SharedPreferences mPrefs = getPreferences(MODE_PRIVATE);...
How do I fix certificate errors when running wget on an HTTPS URL in Cygwin?
... package ca-certificates via Cygwin's setup.exe to get the certificates.
Do NOT use curl or similar hacks to download certificates (as a neighboring answer advices) because that's fundamentally insecure and may compromise the system.
Second, you need to tell wget where your certificates are, sinc...
How do I compile a Visual Studio project from the command-line?
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I know of two ways to do it.
Method 1
The first method (which I prefer) is to use msbuild:
msbuild project.sln /Flags...
Method 2
You can also run:
vcexpress project.sln /build /Flags...
The vcexpress option returns immediately and does n...
How do I use vim registers?
...a register by using a capital letter
"Kyy
You can then move through the document and paste it elsewhere using
"kp
To paste from system clipboard on Linux
"+p
To paste from system clipboard on Windows (or from "mouse highlight" clipboard on Linux)
"*p
To access all currently defined regis...
What are the performance characteristics of sqlite with very large database files? [closed]
I know that sqlite doesn't perform well with extremely large database files even when they are supported (there used to be a comment on the sqlite website stating that if you need file sizes above 1GB you may want to consider using an enterprise rdbms. Can't find it anymore, might be related to an o...
How to get the selected index of a RadioGroup in Android
... there an easy way to get the selected index of a RadioGroup in Android or do I have to use OnCheckedChangeListener to listen for changes and have something that holds the last index selected?
...
How do I find out what version of WordPress is running?
I have just taken over someone's hosted WordPress site. How do I find out what version he is running?
16 Answers
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Memoization in Haskell?
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We can do this very efficiently by making a structure that we can index in sub-linear time.
But first,
{-# LANGUAGE BangPatterns #-}
import Data.Function (fix)
Let's define f, but make it use 'open recursion' rather than call i...