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How to express infinity in Ruby?
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188
If you use ruby 1.9.2, you can use:
>> Float::INFINITY #=> Infinity
>> 3 < ...
How can I pass a member function where a free function is expected?
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146
There isn't anything wrong with using function pointers. However, pointers to non-static membe...
Finding the index of an item in a list
..., "bar", "baz"] and an item in the list "bar" , how do I get its index ( 1 ) in Python?
31 Answers
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How to remove an element from a list by index
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What is the pythonic way to detect the last element in a 'for' loop?
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154
Most of the times it is easier (and cheaper) to make the first iteration the special case inst...
Listing all permutations of a string/integer
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158
First of all: it smells like recursion of course!
Since you also wanted to know the principle,...
Select multiple columns in data.table by their numeric indices
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185
For versions of data.table >= 1.9.8, the following all just work:
library(data.table)
dt &...
How to atomically delete keys matching a pattern using Redis
...g like this
EVAL "return redis.call('del', unpack(redis.call('keys', ARGV[1])))" 0 prefix:[YOUR_PREFIX e.g delete_me_*]
Warning: As the Redis document says, because of performance maters, keys
command should not use for regular operations in production, this
command is intended for debuggi...
Mapping two integers to one, in a unique and deterministic way
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18 Answers
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