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What is the best comment in source code you have ever encountered? [closed]
... The first time I've ever been truly RickRolled - and it was funny. When I see links to YouTube I always expect to be RickRolled (camel cased English!!), but I never never never expected to be RickRolled in code comments.
– Vincent McNabb
Jul 28 '...
How do I dump an object's fields to the console?
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Using introspection is part of the fun of Ruby. It's often useful to subtract an Object's instance_methods from the class' in question to get the methods that are unique: (String.instance_methods - Object.instance_methods).sort
– the Tin ...
Numbering rows within groups in a data frame
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Use ave, ddply, dplyr or data.table:
df$num <- ave(df$val, df$cat, FUN = seq_along)
or:
library(plyr)
ddply(df, .(cat), mutate, id = seq_along(val))
or:
library(dplyr)
df %>% group_by(cat) %>% mutate(id = row_number())
or (the most memory efficient, as it assigns by reference w...
Locate Git installation folder on Mac OS X
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The installer from the git homepage installs into /usr/local/git by default. See also this ans...
C# convert int to string with padding zeros?
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Simply
int i=123;
string paddedI = i.ToString("D4");
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How to convert list to string [duplicate]
...pace between the quotes). Otherwise, you end up with a contiguous string ("123" instead of "1 2 3"). This is OK if that was the intention, but needs to be mentioned in the response.
– Bogdan
May 9 '16 at 19:43
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What does a . in an import statement in Python mean?
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123
That's the new syntax for explicit relative imports. It means import from the current package....
Is dp the same as dip? [duplicate]
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123
Yes, they are the same. There is no difference, its just an alias.
Documentation:
The com...
javascript pushing element at the beginning of an array [duplicate]
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123
Use .unshift() to add to the beginning of an array.
TheArray.unshift(TheNewObject);
See MDN...
How can I check ModelState.IsValid from inside my Razor view [duplicate]
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