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What does “Object reference not set to an instance of an object” mean? [duplicate]
...reading this MSDN article by the same author - Jeffrey Richter. Also check out, much more complex, example of when you can encounter a NullReferenceException.
Some teams using Resharper make use of JetBrains attributes to annotate code to highlight where nulls are (not) expected.
...
Parsing a CSV file using NodeJS
...his old answer (from 2015), 'async' is an npm library that is used. More about it here caolan.github.io/async - to understand why maybe this helps blog.risingstack.com/node-hero-async-programming-in-node-js But javascript has evolved a lot since 2015, and if your question is more about async in gen...
Is Java really slow?
... inlining. By using the additional execution information, it can sometimes outperform ahead-of-time compilers and even (in rare cases) manual inlining. Compare to C/C++ where method calls come with a small performance penalty if compiler decides not to inline.
Synchronization and multi-threading are...
Set android shape color programmatically
...und is an instance of ColorDrawable. Thanks Tyler Pfaff, for pointing this out.
The drawable is an oval and is the background of an ImageView
Get the Drawable from imageView using getBackground():
Drawable background = imageView.getBackground();
Check against usual suspects:
if (background...
bodyParser is deprecated express 4
I am using express 4.0 and I'm aware that body parser has been taken out of the express core, I am using the recommended replacement, however I am getting
...
How do I discard unstaged changes in Git?
...n't need to include --include-untracked if you don't want to be thorough about it.
After that, you can drop that stash with a git stash drop command if you like.
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How do I resize an image using PIL and maintain its aspect ratio?
...ort os, sys
import Image
size = 128, 128
for infile in sys.argv[1:]:
outfile = os.path.splitext(infile)[0] + ".thumbnail"
if infile != outfile:
try:
im = Image.open(infile)
im.thumbnail(size, Image.ANTIALIAS)
im.save(outfile, "JPEG")
exce...
Get Root Directory Path of a PHP project
...xplode('/', $_SERVER['DOCUMENT_ROOT']);
echo $pathInPieces[0];
This will output the server's root directory.
Update: When you use the constant DIRECTORY_SEPARATOR instead of the hardcoded slash ('/') this code is also working under Windows.
Update 2: The $_SERVER global variable is not always av...
How many and which are the uses of “const” in C++?
...so many different effects that is nearly impossible for a beginner to come out alive. Will some C++ guru explain once forever the various uses and whether and/or why not to use them?
...
How to run `rails generate scaffold` when the model already exists?
...ld_controller. Just for clarity, here's the description on that:
Stubs out a scaffolded controller and its views. Pass the model name,
either CamelCased or under_scored, and a list of views as arguments.
The controller name is retrieved as a pluralized version of the model
name...