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How to check for an undefined or null variable in JavaScript?
... property doesn't yield an error and simply returns undefined, which, when converted to a boolean, evaluates to false. So, if you don't care about
0 and false, using if(obj.undefProp) is ok. There's a common idiom based on this fact:
value = obj.prop || defaultValue
which means "if obj has the p...
What is the IntelliJ shortcut to create a local variable?
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Yep! This is the Introduce Variable refactoring. By default, select some text, and then hit Ctrl + Alt + V (for Mac: ⌘+⌥+V). If the expression is incomplete or invalid, IntelliJ will still make a good guess about what you meant and try to fix it for you.
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AsyncTask and error handling on Android
I'm converting my code from using Handler to AsyncTask . The latter is great at what it does - asynchronous updates and handling of results in the main UI thread. What's unclear to me is how to handle exceptions if something goes haywire in AsyncTask#doInBackground .
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How do you produce a .d.ts “typings” definition file from an existing JavaScript library?
...ucco-and-Luke-Hoban-Inside-TypeScript at 00:33:52 they had built a tool to convert WebIDL and WinRT metadata into TypeScript d.ts
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How to use a variable for a key in a JavaScript object literal?
... 'theTop' : 10 }
The PropertyName theTop is an IdentifierName, so it gets converted to the 'theTop' string value, which is the string value of 'theTop'.
It is not possible to write object initializers (literals) with variable keys.
The only three options are IdentifierName (expands to string liter...
Which exception should I raise on bad/illegal argument combinations in Python?
... @RayLuo you may have sanity-checked what the video's saying and converted it into a palateable, sensible alternative message, but that is what the video says, and it's what someone who doesn't have a lot of experience and common sense will come away with.
– Rob Grant...
jQuery `.is(“:visible”)` not working in Chrome
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It seems jQuery's :visible selector does not work for some inline elements in Chrome. The solution is to add a display style, like "block" or "inline-block" to make it work.
Also note that jQuery has a somewhat different definition of what is visible ...
Correct way to write line to file?
...d be to use:
f = open('myfile', 'w')
f.write('hi there\n') # python will convert \n to os.linesep
f.close() # you can omit in most cases as the destructor will call it
Quoting from Python documentation regarding newlines:
On output, if newline is None, any '\n' characters written are transl...
Why is string concatenation faster than array join?
...er browsers will eventually go away, but the odds of someone going back to convert all those array joins isn’t likely. It’s better to code for the future as long as it isn’t a major inconvenience to your current users. Odds are there are more important things to worry about than concatenation ...
Design RESTful query API with a long list of query parameters [closed]
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URI Pattern: “poc/test?code=1&code=2&code=3
@QueryParam will convert the query parameter “orderBy=age&orderBy=name” into java.util.List automatically.
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