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NodeJS: Saving a base64-encoded image to disk
My Express app is receiving a base64-encoded PNG from the browser (generated from canvas with toDataURL() ) and writing it to a file. But the file isn't a valid image file, and the "file" utility simply identifies it as "data".
...
Difference between float and decimal data type
...@a: 99.999999999000000000000000000000
@b + @b + @b: 100
The decimal did exactly what's supposed to do on this cases, it
truncated the rest, thus losing the 1/3 part.
So for sums the decimal is better, but for divisions the float is
better, up to some point, of course. I mean, using DECIMAL will n...
Running a cron every 30 seconds
...30-sec boundaries, keep commands in sync.
* * * * * /path/to/executable param1 param2
* * * * * ( sleep 30 ; /path/to/executable param1 param2 )
You'll see I've added comments and formatted to ensure it's easy to keep them synchronised.
Both cron jobs actually run every minute but the ...
What is the best way to force yourself to master vi? [closed]
...r of viemu , clearing up a lot of the misconceptions about vi, as well as explaining why it's a good idea (and why it's been very popular for the last 30 years+). The same guy also has a great set of graphical cheat sheets that teach the basics a few bits at a time.
...
How to get a complete list of object's methods and attributes?
...f hasattr( obj, '__class__'):
ret.append('__class__')
ret.extend( get_class_members(obj.__class__) )
ret = uniq( ret )
return ret
(Test code and output are deleted for brevity, but basically for new-style objects we seem to have the same results for get_object_attrs(...
Can I find out the return value before returning while debugging in Intellij?
...on Object method(){ . This will allow you to watch for the entrance and exit of the method. I believe you have to use this in conjunction with "Watch method return values" like stated above, but I haven't been able to completely test this as it takes too long to compute. Beware, this does dramati...
npm command to uninstall or prune unused packages in Node.js
...is automatically when package-locks are enabled, so this is not necessary except for removing development packages with the --production flag.
Run npm prune to remove modules not listed in package.json.
From npm help prune:
This command removes "extraneous" packages. If a package name is provided...
What characters are forbidden in Windows and Linux directory names?
I know that / is illegal in Linux, and the following are illegal in Windows
(I think) * . " / \ [ ] : ; | ,
...
Is it possible to figure out the parameter type and return type of a lambda?
...traits implementation based on Specializing a template on a lambda in C++0x which can give the parameter types. The trick, as described in the answer in that question, is to use the decltype of the lambda's operator().
template <typename T>
struct function_traits
: public function_trait...
Why do some C# lambda expressions compile to static methods?
...
This is most likely because there are no closures, for example:
int age = 25;
Action<string> withClosure = s => Console.WriteLine("My name is {0} and I am {1} years old", s, age);
Action<string> withoutClosure = s => Console.WriteLine("My name is {0}", s);
Conso...