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Check if object exists in JavaScript
...beObject - is an object, the alert would be shown.
I have an example in my site.
https://sites.google.com/site/javaerrorsandsolutions/home/javascript-dynamic-checkboxes
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...
How to fix HTTP 404 on Github Pages?
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this fixed it for me. My user site was originally working without it but stopped working. You can just add a file online and commit it there too. I did this, refreshed and it instantly worked.
– bot19
May 24 at 2:23
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Accessing localhost:port from Android emulator
...Dir).vs\config\applicationhost.config for Visual Studio
2015), find your site's binding element, and add
<binding protocol="http" bindingInformation="*:8080:*" />
Make sure to add it as a second binding instead of modifying the existing one or VS will just re-add a new site appended with...
Replace spaces with dashes and make all letters lower-case
...re at the beginning, they won't be replaced
– Bonjour123
Aug 1 '19 at 21:13
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How to write URLs in Latex? [closed]
... This does not work correctly for me. For example, \url{https://asdfg.com\#123} produces # in text, however, the actual link it produces is https://asdfg.com%23123.
– MaxPowers
Aug 2 at 13:23
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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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