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what is the difference between ?:, ?! and ?= in regex?
...ing group and analyse each behaviour.
() capturing group - the regex inside the parenthesis must be matched and the match create a capturing group
(?:) non capturing group - the regex inside the parenthesis must be matched but doesn't not create the capturing group
(?=) positive look ahead - a...
How can I install a local gem?
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If you want to work on a locally modified fork of a gem, the best way to do so is
gem 'pry', path: './pry'
in a Gemfile.
... where ./pry would be the clone of your repository. Simply run bundle install once, and any changes in the gem sources you ma...
Why is “int i = 2147483647 + 1;” OK, but “byte b = 127 + 1;” is not compilable?
..., ... Java does support coercions if they are, in a sense, non-loss (Java calls this "widening").
And no, the word "coercion" did not need correcting. It was chosen very deliberately and correctly at that. From the closest source to hand (Wikipedia) : "In most languages, the word coercion is use...
How do I use format() on a moment.js duration?
...:10 (even with forcelength on) If its not formatting... then it should be called something else, formats should be standardised.
– Piotr Kula
Apr 23 '15 at 21:40
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Implementing slicing in __getitem__
...key) #Get the data from elsewhere
else:
raise TypeError, "Invalid argument type."
The slice doesn't return the same type, which is a no-no, but it works for me.
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How do I check that a Java String is not all whitespaces?
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I would use the Apache Commons Lang library. It has a class called StringUtils that is useful for all sorts of String operations. For checking if a String is not all whitespaces, you can use the following:
StringUtils.isBlank(<your string>)
Here is the reference: StringUtils....
How do I get the file name from a String containing the Absolute file path?
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Calling toString() is so awkward.
– PetroCliff
Oct 3 '18 at 4:37
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Command to get time in milliseconds
...nstalling coreutils using Homebrew. This will give you access to a command called gdate that will behave as date does on Linux systems.
brew install coreutils
For a more "native" experience, you can always add this to your .bash_aliases:
alias date='gdate'
Then execute
$ date +%s%N
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Efficient evaluation of a function at every cell of a NumPy array
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I am afraid that the vectorized function cannot be faster than the "manual" double loop iteration and assignment through all the array elements. Especially, because it stores the result to a newly created variable (and not directly to...
What is the difference between “long”, “long long”, “long int”, and “long long int” in C++?
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long and long int are identical. So are long long and long long int. In both cases, the int is optional.
As to the difference between the two sets, the C++ standard mandates minimum ranges for each, and that long long is at least as wide as long....