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What is the formal difference in Scala between braces and parentheses, and when should they be used?
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370
I tried once to write about this, but I gave up in the end, as the rules are somewhat diffuse....
How to avoid reinstalling packages when building Docker image for Python projects?
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143
Try to build a Dockerfile which looks something like this:
FROM my/base
WORKDIR /srv
ADD ./requ...
With bash, how can I pipe standard error into another process?
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mmlb
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answered Mar 27 '12 at 11:28
ScotScot
1,73611 gold badge1111...
How to compare software version number using js? (only number)
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138
The basic idea to make this comparison would be to use Array.split to get arrays of parts from ...
Best way to replace multiple characters in a string?
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13 Answers
13
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How can I do an asc and desc sort using underscore.js?
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365
You can use .sortBy, it will always return an ascending list:
_.sortBy([2, 3, 1], function(nu...
SQL RANK() versus ROW_NUMBER()
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answered Oct 12 '11 at 22:38
Ritesh MengjiRitesh Mengji
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Maven 3 warnings about build.plugins.plugin.version
Since I updated to Maven 3 I get the following warning messages at each build :
7 Answers
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Single Line Nested For Loops
...f the list comprehension (here (x,y)):
>>> [(x, y) for x in [1,2,3] for y in [3,1,4] if x != y]
[(1, 3), (1, 4), (2, 3), (2, 1), (2, 4), (3, 1), (3, 4)]
It's exactly the same as this nested for loop (and, as the tutorial says, note how the order of for and if are the same).
>>>...
Reorder levels of a factor without changing order of values
...f <- data.frame(f = 1:4, g = letters[1:4])
df
# f g
# 1 1 a
# 2 2 b
# 3 3 c
# 4 4 d
levels(df$g)
# [1] "a" "b" "c" "d"
df$g <- factor(df$g, levels = letters[4:1])
# levels(df$g)
# [1] "d" "c" "b" "a"
df
# f g
# 1 1 a
# 2 2 b
# 3 3 c
# 4 4 d
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