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JavaScript checking for null vs. undefined and difference between == and ===
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How do I check a variable if it's null or undefined...
Is the variable null:
if (a === null)
// or
if (a == null) // but see note below
...but note the latter will also be true if a is undefined.
Is it undefined:
if (typeof a === "undefined")
// or
if (a === undefi...
Use of an exclamation mark in a Git commit message via the command line
How do I enter an exclamation point into a Git commit message from the command line?
6 Answers
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How to get a enum value from string in C#?
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baseKey choice;
if (Enum.TryParse("HKEY_LOCAL_MACHINE", out choice)) {
uint value = (uint)choice;
// `value` is what you're looking for
} else { /* error: the string was not an enum member */ }
Before .NET 4.5, you had to do the following, which is more error-p...
How to click first link in list of items after upgrading to Capybara 2.0?
How to click first link in that case:
7 Answers
7
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Proper way to add svn:executable
I have a few files that have been executable before svn adding them. They have the svn:executable property set. Now, a few other files were checked in without the executable bit do not have it, and I want to set the svn:executable property:
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Merging 2 branches together in GIT
I've only just started to use GIT and think its wonderful, however I'm a little confused over what the merge command does.
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Making text background transparent but not text itself
So I am having a problem. I have looked around and looked around but no luck. I would like to make the background of my body transparent but leave the text non transparent. As it is right now I keep making both the same opacity. Here is my code:
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__init__ for unittest.TestCase
I'd like to add a couple of things to what the unittest.TestCase class does upon being initialized but I can't figure out how to do it.
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How to get the title of HTML page with JavaScript?
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What's the point of including <script> tag in answer if question is about JavaScript? Also, type attribute is completely unnecessary and IMHO console.log() is much better for debugging than alert().
– Michał P...
Scala @ operator
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It enables one to bind a matched pattern to a variable. Consider the following, for instance:
val o: Option[Int] = Some(2)
You can easily extract the content:
o match {
case Some(x) => println(x)
case None =>
}
But what if you w...