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How can we match a^n b^n with Java regex?
... to say, YES! You can most certainly write a Java regex pattern to match anbn. It uses a positive lookahead for assertion, and one nested reference for "counting".
Rather than immediately giving out the pattern, this answer will guide readers through the process of deriving it. Various hints are giv...
What is the difference between instanceof and Class.isAssignableFrom(…)?
Which of the following is better?
14 Answers
14
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What is object slicing?
Someone mentioned it in the IRC as the slicing problem.
18 Answers
18
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What does ||= (or-equals) mean in Ruby?
What does the following code mean in Ruby?
23 Answers
23
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Modulo operation with negative numbers
In a C program i was trying the below operations(Just to check the behavior )
12 Answers
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Ruby: How to turn a hash into HTTP parameters?
... from the gem.
Julien, your self-answer is a good one, and I've shameless borrowed from it, but it doesn't properly escape reserved characters, and there are a few other edge cases where it breaks down.
require "addressable/uri"
uri = Addressable::URI.new
uri.query_values = {:a => "a", :b =>...
Java rounding up to an int using Math.ceil
...57/32 = 4.90625 , I need to round up, I've looked around and this seems to be the right method.
15 Answers
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Is there any pythonic way to combine two dicts (adding values for keys that appear in both)?
...>> from collections import Counter
>>> A = Counter({'a':1, 'b':2, 'c':3})
>>> B = Counter({'b':3, 'c':4, 'd':5})
>>> A + B
Counter({'c': 7, 'b': 5, 'd': 5, 'a': 1})
Counters are basically a subclass of dict, so you can still do everything else with them you'd norma...
Oracle “(+)” Operator
...hecking some old SQL Statements for the purpose of documenting them and probably enhancing them.
4 Answers
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Comparing two NumPy arrays for equality, element-wise
...o compare two NumPy arrays for equality (where equality is defined as: A = B iff for all indices i: A[i] == B[i] )?
6 Ans...