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Check if object exists in JavaScript
...her undefined nor null. Of course you can be explicit, because it may help readability.
If you restrict the question to check if an object exists, typeof o == "object" may be a good idea, except if you don't consider arrays objects, as this will also reported to be the type of object which may leav...
python max function using 'key' and lambda expression
...thing obvious, like integers.
Meaning of the lambda expression? How to read them? How do they work?
That's sort of a larger question. In simple terms, a lambda is a function you can pass around, and have other pieces of code use it. Take this for example:
def sum(a, b, f):
return (f(a) + ...
Phonegap Cordova installation Windows
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I faced the same problem and struggled for an hour to get pass through by reading the documents and the other issues reported in Stack Overflow but I didn't find any answer to it. So, here is the guide to successfully run the phonegap/cordova in Windows Machine.
Follow these steps
Download and ...
Rails layouts per action?
...to do simpler things with one-liner the following is possible. Its easy to read and place in top of the controller. --- layout Proc.new{ ['index', 'new', 'create'].include?(action_name) ? 'some_layout' : 'other_layout' }
– holli
Aug 28 '11 at 21:13
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What does “exec sp_reset_connection” mean in Sql Server Profiler? [duplicate]
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(like @@error)
Stops all EC's (execution contexts)
that are child threads of a parent EC
executing a parallel query
Waits for any outstanding I/O
operations that is outstanding
Frees any held buffers on the
server by the connection
Unlocks any buffer resources
that are used by t...
How to add elements of a Java8 stream into an existing List
...s are designed to support parallelism, even over collections that aren't thread-safe. The way they do this is to have each thread operate independently on its own collection of intermediate results. The way each thread gets its own collection is to call the Collector.supplier() which is required to ...
Is it feasible to compile Python to machine code?
...ort. For example, duck typing comes to mind. Many functions in Python that read input can take a file or file-like object, as long as it supports certain operations, eg. read() or readline(). If you think about what it would take to map this type of support to C, you begin to imagine exactly the sor...
Print a list in reverse order with range()?
... this produces a non-list range object, which functions effectively like a read-only list (but uses way less memory, particularly for large ranges).
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Difference between Observer, Pub/Sub, and Data Binding
...implementation for data binding? Ok, here's a stupid one:
a background thread is started that constantly checks the bound property on an object.
if that thread detects that the value of the property has changed since last check, copy the value over to the bound item.
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How to request Administrator access inside a batch file
...AYEDEXPANSION & set "_FilePath=%~1"
if NOT EXIST "!_FilePath!" (echo/Read RequestAdminElevation usage information)
:: UAC.ShellExecute only works with 8.3 filename, so use %~s1
set "_FN=_%~ns1" & echo/%TEMP%| findstr /C:"(" >nul && (echo/ERROR: %%TEMP%% path can not contain ...