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Why does instanceof return false for some literals?
... // true
As you can see both typeof and instanceof are insufficient to test whether a value is a boolean, a number or a string - typeof only works for primitive booleans, numbers and strings; and instanceof doesn't work for primitive booleans, numbers and strings.
Fortunately there's a simple s...
Predicate in Java
...egular expression.
This is essentially an OOP abstraction for a boolean test.
For example, you may have a helper method like this:
static boolean isEven(int num) {
return (num % 2) == 0; // simple
}
Now, given a List<Integer>, you can process only the even numbers like this:
Lis...
Best way to check if a URL is valid
...l('/'); // for my case https://www.xrepeater.com
$posted_url = "home";
// Test with one by one
/*$posted_url = "/home";
$posted_url = "xrepeater.com";
$posted_url = "www.xrepeater.com";
$posted_url = "http://www.xrepeater.com";
$posted_url = "https://www.xrepeater.com";
$posted_url = "https:/...
How to validate phone numbers using regex
...ing fluff until you have just the "number". Doing this solves 2 problems - testing the result is now easy and you can now ensure that values rendered back out for display can all be formatted consistently. The first comment on this answer about the "Complicator's Gloves" is a good read... sometimes...
How slow are .NET exceptions?
...evolves around them being slow while the other side claims (with benchmark test) that the speed is not the issue. I've read numerous blogs, articles, and posts pertaining one side or the other. So which is it?
...
C++ Tuple vs Struct
... collected using gcc-4.9.2 and clang-4.0.0:
std::vector<StructData> test_struct_data(const size_t N) {
std::vector<StructData> data(N);
std::transform(data.begin(), data.end(), data.begin(), [N](auto item) {
std::random_device rd;
std::mt19937 gen(rd());
...
Logging uncaught exceptions in Python
...
Anyone trying to test the above code, make sure that you generate a traceback error while testing your function. SyntaxError are not being handled by sys.excepthook. You can use print(1/0) and this shall invoke the function you have defined t...
Replace whole line containing a string using Sed
...>.*/<expression>SE_LABEL = ABC<expression>/g' MYR2.xml > test.txt
– Nasri Najib
Oct 24 '14 at 7:46
...
Request is not available in this context
...ption occurs in the logger (even if handled).
It appears that rather than testing for Request availability, you can test for Handler availability: when there is no Request, it would be strange to still have a request handler. And testing for Handler does not raise that dreaded Request is not availa...
Project structure for Google App Engine
... by App Engine
myapp/*.py: app-specific python code
views.py, models.py, tests.py, __init__.py, and more
templates/*.html: templates (or myapp/templates/*.html)
Here are some code examples that may help as well:
main.py
import wsgiref.handlers
from google.appengine.ext import webapp
from mya...