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What are the Ruby Gotchas a newbie should be warned about? [closed]
... while (not(expression)); in C/C++/...), actually never runs the statement if the expression is already true. This is because statement until expression is actually syntactic sugar over
until expression
statement
end
, the equivalent of which in C/C++ is while (not(expression)) statement; just ...
How do I use a file grep comparison inside a bash if/else statement?
...
From grep --help, but also see man grep:
Exit status is 0 if any line was selected, 1 otherwise;
if any error occurs and -q was not given, the exit status is 2.
if grep --quiet MYSQL_ROLE=master /etc/aws/hosts.conf; then
echo exists
else
echo not found
fi
You may want to u...
When to choose checked and unchecked exceptions
..., you try reading a file but someone deletes it between the time you check if it exists and the time the read operation begins. By declaring a checked exception, you are telling the caller to anticipate this failure.
Reasonable to recover from: There is no point telling callers to anticipate excepti...
javascript check for not null
...e snippet, where we retrieve a form value.
Before further processing check if the value is not null..
10 Answers
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How to check what version of jQuery is loaded?
...chine? The client may have jQuery loaded but I don't know how to check it. If they have it loaded how do I check the version and the prefix such as:
...
How to test a merge without actually merging first
...is a way of simulating what will happen until you try the merge. However, if you make sure that the output of git status is empty before you do the merge, it is quite safe to just go ahead and try it. If you get conflicts, you can immediately get back to the state you were at before with:
git res...
Finding what branch a Git commit came from
...hich have the given commit in their history. Obviously this is less useful if the commit's already been merged.
Search the reflogs
If you are working in the repository in which the commit was made, you can search the reflogs for the line for that commit. Reflogs older than 90 days are pruned by gi...
How do I convert a decimal to an int in C#?
... Be careful, because Convert.ToInt32 and Decimal.ToInt32 behave differently. From MSDN: Decimal.ToInt32 - The return value is the integral part of the decimal value; fractional digits are truncated. Convert.ToInt32 - Return value rounded to the nearest 32-bit signed integer. If value is ha...
How can I do something like a FlowLayout in Android?
...
If you watch the talk I gave at the Devoxx University day (available on parleys.com) you will learn how to do it yourself. During the talk I wrote a FlowLayout implementation live on stage to show how simple it is to write cu...
How to check if a string array contains one string in JavaScript? [duplicate]
...st this string against the array values and apply a condition the result - if the array contains the string do "A", else do "B".
...