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Blocks and yields in Ruby
...ode block in order to perform arbitrary segments of code.
When a method expects a block, it invokes it by calling the yield function.
This is very handy, for instance, to iterate over a list or to provide a custom algorithm.
Take the following example:
I'm going to define a Person class initi...
How do I import a Swift file from another Swift file?
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I had the same problem, also in my XCTestCase files, but not in the regular project files.
To get rid of the:
Use of unresolved identifier 'PrimeNumberModel'
I needed to import the base module in the test file. In my case, my target is called 'myproje...
git replacing LF with CRLF
Running git on a Windows XP machine, using bash. I exported my project from SVN, and then cloned a bare repository.
20 Answ...
PHP code is not being executed, instead code shows on the page
I'm trying to execute some PHP code on a project (using Dreamweaver) but the code isn't being run.
27 Answers
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Ruby: What is the easiest way to remove the first element from an array?
... Best answer since (a) evaluates to the trimmed array, and it works as expected on an empty array: [].drop(1) => []
– fearless_fool
Oct 21 '13 at 0:28
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How would you make a comma-separated string from a list of strings?
...sing python 2.7 (which you shouldn't by now) then using str will raise an exception if any item in the list has unicode.
– kroiz
May 26 at 13:54
add a comment
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Pythonic way of checking if a condition holds for any element of a list
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any():
if any(t < 0 for t in x):
# do something
Also, if you're going to use "True in ...", make it a generator expression so it doesn't take O(n) memory:
if True in (t < 0 for t in x):
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Can't find the 'libpq-fe.h header when trying to install pg gem
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How can I remove the first line of a text file using bash/sed script?
I need to repeatedly remove the first line from a huge text file using a bash script.
16 Answers
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Selecting with complex criteria from pandas.DataFrame
For example I have simple DF:
4 Answers
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