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What is the difference between map and flatMap and a good use case for each?
... into a single RDD of results.
rdd.flatMap(_.split(" ")).collect
res2: Array[String] = Array("Roses", "are", "red", "Violets", "are", "blue")
We have multiple words per line, and multiple lines, but we end up with a single output array of words
Just to illustrate that, flatMapping from a c...
How do I trim a file extension from a String in Java?
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290
This is the sort of code that we shouldn't be doing ourselves. Use libraries for the mundane s...
How to debug Apache mod_rewrite
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284
One trick is to turn on the rewrite log. To turn it on,try these lines in your apache main con...
Small Haskell program compiled with GHC into huge binary
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2 Answers
2
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Best way of returning a random boolean value
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245
A declarative snippet using Array#sample:
random_boolean = [true, false].sample
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redirect COPY of stdout to log file from within bash script itself
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297
#!/usr/bin/env bash
# Redirect stdout ( > ) into a named pipe ( >() ) running "tee"
exe...
Find and Replace text in the entire table using a MySQL query
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edited Aug 7 '12 at 4:45
answered Aug 7 '12 at 4:06
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How to split last commit into two in Git
...o that now it looks like this:
1
something
something else
something again
2
Now I decide that I want to split it into two, and I want the insertion of the
first line to be in the first commit, and the insertion of the last line to be
in the second commit.
First I go back to HEAD's parent, but I ...
Maximum on http header values?
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325
No, HTTP does not define any limit. However most web servers do limit size of headers they acce...