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Test if something is not undefined in JavaScript
...
typeof:
var foo;
if (typeof foo == "undefined"){
//do stuff
}
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ExpressJS How to structure an application?
... extension naming conventions to distinguish tests from production code.
foo.js has the module "foo"'s code
foo.tape.js has the node-based tests for foo and lives in the same dir
foo.btape.js can be used for tests that need to execute in a browser environment
I use filesystem globs and the find ...
How do I break out of a loop in Perl?
...
Additional data (in case you have more questions):
FOO: {
for my $i ( @listone ){
for my $j ( @listtwo ){
if ( cond( $i,$j ) ){
last FOO; # --->
# |
} ...
Best practice for partial updates in a RESTful service
...tch-like-an-idiot PATCH [ { "op": "test", "path": "/a/b/c", "value": "foo" }, { "op": "remove", "path": "/a/b/c" }, { "op": "add", "path": "/a/b/c", "value": [ "foo", "bar" ] }, { "op": "replace", "path": "/a/b/c", "value": 42 }, { "op": "move", "from": "/a/b/c", "path": "/a/b/d...
What's the difference between “Request Payload” vs “Form Data” as seen in Chrome dev tools Network t
...ok like this:
POST /some-path HTTP/1.1
Content-Type: application/json
{ "foo" : "bar", "name" : "John" }
If you submit this per AJAX the browser simply shows you what it is submitting as payload body. That’s all it can do because it has no idea where the data is coming from.
If you submit a H...
How to get the size of a string in Python?
...not counted and can be dangerous if not used correctly.
>>> len('foo')
3
>>> len('\foo')
3
>>> len('\xoo')
File "<stdin>", line 1
SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 0-1: truncated \xXX escape
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Extract traceback info from an exception object
...ntly set using the with_traceback method of exceptions:
raise Exception("foo occurred").with_traceback(tracebackobj)
These features are minimally described as part of the raise documentation.
All credit for this part of the answer should go to Vyctor, who first posted this information. I'm incl...
Python: Bind an Unbound Method?
...t: I'm working in Python 3 -- YMMV).
Consider this simple class:
class Foo(object):
def __init__(self, value):
self._value = value
def value(self):
return self._value
def set_value(self, value):
self._value = value
Here's what you can do with it:
>>...
What is the difference between '@' and '=' in directive scope in AngularJS?
... @JonathanAquino, yes that works, but @ would be more appropriate -- with foo="{{1+1}}" -- because we don't need two-way data binding here. The point I tried to make in the comment above is that we should use = only when the directive needs two-way data binding. Use @ or & otherwise.
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What does Class mean in Java?
...ill using the generic version.
if you knew the class, you'd use Class<Foo>. That way you can create a new instance, for example, without casting: Foo foo = clazz.newInstance();
if you don't use generics at all, you'll get a warning at least (and not using generics is generally discouraged as...