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Ruby, remove last N characters from a string?
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13 Answers
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C dynamically growing array
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213
I can use pointers, but I am a bit afraid of using them.
If you need a dynamic array, you can'...
How does java do modulus calculations with negative numbers?
Am I doing modulus wrong? Because in Java -13 % 64 is supposed to evaluate to -13 but I get 51 .
14 Answers
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On localhost, how do I pick a free port number?
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231
Do not bind to a specific port, or bind to port 0, e.g. sock.bind(('', 0)). The OS will then p...
Why is GHC so large/big?
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Simon MarlowSimon Marlow
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Accessing dict_keys element by index in Python3
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Call list() on the dictionary instead:
keys = list(test)
In Python 3, the dict.keys() method returns a dictionary view object, which acts as a set. Iterating over the dictionary directly also yields keys, so turning a dictionary into a list results in a list of all the keys:
>>> te...
How to determine the longest increasing subsequence using dynamic programming?
...N) = O(N log N)
Now let's do a real example:
Collection of integers:
2 6 3 4 1 2 9 5 8
Steps:
0. S = {} - Initialize S to the empty set
1. S = {2} - New largest LIS
2. S = {2, 6} - New largest LIS
3. S = {2, 3} - Changed 6 to 3
4. S = {2, 3, 4} - New largest LIS
5. S = {1, 3, 4} - Changed 2 to 1...
Ruby on Rails console is hanging when loading
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423
Restarting Spring should fix the hanging commands:
$ bin/spring stop
I experienced hanging co...
Differences between Oracle JDK and OpenJDK
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351
Both OpenJDK and Oracle JDK are created and maintained currently by Oracle only.
OpenJDK and ...
(![]+[])[+[]]… Explain why this works
...using the bracket notation on String values was not part of the ECMAScript 3rd. Edition Specification, (that's why the charAt method existed).
However this kind of "index properties" that represent the characters of a string were standardized on ECMAScript 5, and even before the standardization the...