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javascript set a variable if undefined
... x === 'undefined') ? your_default_value : x;
On newer browsers it's actually safe to write:
var x = (x === undefined) ? your_default_value : x;
but be aware that it is possible to subvert this on older browsers where it was permitted to declare a variable named undefined that has a defined val...
Java's Interface and Haskell's type class: differences and similarities?
...d say that an interface is kind of like a type class SomeInterface t where all of the values have the type t -> whatever (where whatever does not contain t). This is because with the kind of inheritance relationship in Java and similar languages, the method called depends on the type of object th...
What is the difference between client-side and server-side programming?
...php echo 42; ?>;
alert(baz);
</script>
Step 1, PHP executes all code between <?php ?> tags. The result is this:
<script type="text/javascript">
var foo = 'bar';
var baz = 42;
alert(baz);
</script>
The file_put_contents call did not result in anything,...
Convert a string to regular expression ruby
...
This method will safely escape all characters with special meaning:
/#{Regexp.quote(your_string)}/
For example, . will be escaped, since it's otherwise interpreted as 'any character'.
Remember to use a single-quoted string unless you want regular strin...
What is the maximum depth of the java call stack?
...
public foo() { try { foo(); } finally { foo(); } } can run 'virtually' forever, in java only though.
– Felype
Mar 23 '15 at 16:45
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How does the extend() function work in jQuery?
... precise in explaining how extend works, so I ran a little test:
var a = {foo: 1, bar: 1};
var b = {foo: 2, baz: 2};
var c = {foo: 3};
var r = jQuery.extend(a,b,c);
console.log("A: Foo=" + a.foo + " Bar=" + a.bar + " Baz=" + a.baz);
console.log("B: Foo=" + b.foo + " Bar=" + b.bar + " Baz=" + b.baz)...
diff current working copy of a file with another branch's committed copy
I have a repo with file foo in the master branch. I switched to bar branch and made some changes to foo . How can I now run a git diff between this copy (which isn't committed yet) and the copy of the master branch?
...
How do I extract the contents of an rpm?
...
$ mkdir packagecontents; cd packagecontents
$ rpm2cpio ../foo.rpm | cpio -idmv
$ find .
For Reference: the cpio arguments are
-i = extract
-d = make directories
-m = preserve modification time
-v = verbose
I found the answer over here: lontar's answer
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Is it bad practice to make a setter return “this”?
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I don't think there's anything specifically wrong with it, it's just a matter of style. It's useful when:
You need to set many fields at once (including at construction)
you know which fields you need to set at the time you're writing the code, and
there are m...
(Deep) copying an array using jQuery [duplicate]
...y an (ordered, not associative) array of objects. I'm using jQuery. I initially tried
8 Answers
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