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How to check whether a string contains a substring in Ruby
...clude on it's own is not ideal as it can throw a NoMethodError if nil test = nil test.include?("test") NoMethodError: undefined method `include?' for nil:NilClass should always convert the value being included to the expected value:- test.to_s.include?("test")
–...
How do you design object oriented projects? [closed]
...e to develop and check how it looks. These programs will become functional tests of your library when completed.
After this first iteration, you will have a better understanding on how things interact, got out the details and the rough spots, solved issues with a slapped duct tape patch. You are re...
Find out time it took for a python script to complete execution
...ate-able piece of code, timeit comes in handy.
From the timeit docs,
def test():
"Stupid test function"
L = []
for i in range(100):
L.append(i)
if __name__=='__main__':
from timeit import Timer
t = Timer("test()", "from __main__ import test")
print t.timeit()
The...
Can I set variables to undefined or pass undefined as an argument?
...tion statement lists, the unpassed arguments are set to undefined. You can test for that with eg.:
function dosomething(arg1, arg2) {
if (arg2===undefined)
arg2= DEFAULT_VALUE_FOR_ARG2;
...
}
With this method you can't tell the difference between dosomething(1) and dosomething(1, unde...
Is there any way to call a function periodically in JavaScript?
...f strings that will be "evaled" to those functions.
// example 1
function test() {
alert('called');
}
var interval = setInterval(test, 10000);
Or:
// example 2
var counter = 0;
var interval = setInterval(function() { alert("#"+counter++); }, 5000);
...
Download a single folder or directory from a GitHub repo
...an example.
Navigate to the folder you want to download. Let's download /test from master branch.
Modify the URL for subversion. Replace tree/master with trunk.
https://github.com/lodash/lodash/tree/master/test ➜
https://github.com/lodash/lodash/trunk/test
Download the folder. Go to the comma...
How do I use sudo to redirect output to a location I don't have permission to write to?
...rformed by your shell which does not have the permission to write to /root/test.out. The redirection of the output is not performed by sudo.
There are multiple solutions:
Run a shell with sudo and give the command to it by using the -c option:
sudo sh -c 'ls -hal /root/ > /root/test.out'
Cre...
Mechanisms for tracking DB schema changes [closed]
...me of our tasks this way (pushing builds up to a staging server, deploying tested code to a production server) but we're still doing database updates manually. I would like to find or create a solution that allows us to work efficiently across servers with different environments while continuing to...
LINQ equivalent of foreach for IEnumerable
...uce very strange and potentially non-deterministic results.
The following test using "ForEach" extension method passes:
[Test]
public void ForEachExtensionWin()
{
//Yes, I know there is an Observable.Range.
var values = Enumerable.Range(0, 10);
var observable = Observable.Create<Fu...
Override Java System.currentTimeMillis for testing time sensitive code
...ncy injection, but even if you used a replaceable singleton you would gain testability.
This could almost be automated with search and replace for the singleton version:
Replace Calendar.getInstance() with Clock.getInstance().getCalendarInstance().
Replace new Date() with Clock.getInstance().newD...