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Is there a null-coalescing (Elvis) operator or safe navigation operator in javascript?
...king at CoffeeScript if you want an alternative syntax. It has some shorthand that is similar to what you are looking for.
For example The Existential Operator
zip = lottery.drawWinner?().address?.zipcode
Function shortcuts
()-> // equivalent to function(){}
Sexy function calling
func '...
Is there a difference between “raise exception()” and “raise exception” without parenthesis?
...
The short answer is that both raise MyException and raise MyException() do the same thing. This first form auto instantiates your exception.
The relevant section from the docs says, "raise evaluates the first expression as the exception object. It must be either a subcla...
Using vagrant to run virtual machines with desktop environment
...l machines, running on VirtualBox. We would like to move one step further, and use the capabilities of Vagrant to have the description of the machine in a text file and then be able to "raise" that machine based on that text file. Combined to puppet, this would solve us the problem that everyone hav...
Timeout for python requests.get entire response
I'm gathering statistics on a list of websites and I'm using requests for it for simplicity. Here is my code:
19 Answers
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Check if a string contains a number
...mbers in what I'd like to be a numberless string.
I need to enter a string and check to see if it contains any numbers and if it does reject it.
...
Batch renaming files with Bash
... to remove their version numbers? I've been toying around with both expr and %% , to no avail.
10 Answers
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How to escape special characters in building a JSON string?
... edited Jun 21 '16 at 1:12
Andrew
11.9k88 gold badges6666 silver badges9090 bronze badges
answered Oct 4 '13 at 7:56
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How to check if a variable exists in a FreeMarker template?
...:
[#if userName??]
Hi ${userName}, How are you?
[/#if]
Or with the standard freemarker syntax:
<#if userName??>
Hi ${userName}, How are you?
</#if>
To check if the value exists and is not empty:
<#if userName?has_content>
Hi ${userName}, How are you?
</#if>
...
Is there a destructor for Java?
...hat need to explicitly tidy up, the convention is to define a close method and use finalize only for sanity checking (i.e. if close has not been called do it now and log an error).
There was a question that spawned in-depth discussion of finalize recently, so that should provide more depth if requi...
Bash: Copy named files recursively, preserving folder structure
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@mahemoff cp -R --parents and rsync -rR copies both files and directories relatively.
– Vortico
Jun 5 '19 at 8:43
add a commen...