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Are there disadvantages to using a generic varchar(255) for all text-based fields?
...ap String fields to VARCHAR(255) by default and I never bothered to override it).
7 Answers
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Read an Excel file directly from a R script
...character data (i.e., not comma-formatted numbers, dates, formulas with divide-by-zero errors, missing values, etc. etc. ..) I generally have no problem with this process.
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How does HashSet compare elements for equality?
...want a non-default equality relation (e.g. "all users with a negative user ID are considered equal"). This is almost never implemented on the type itself (i.e. Foo doesn't implement IEqualityComparer<Foo>) but in a separate type which is only used for comparisons.
Implement equality in the typ...
Jelly Bean DatePickerDialog — is there a way to cancel?
...sure if it's appropriate to close this as a duplicate, since i think I provided a much better explanation of the issue. I'm not sure if I should edit the other question and paste this content there, but I'm not comfortable changing someone else's question too much. ---
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CSS filter: make color image with transparency white
...nvert(1);
html {
background: red;
}
p {
float: left;
max-width: 50%;
text-align: center;
}
img {
display: block;
max-width: 100%;
}
.filter {
-webkit-filter: brightness(0) invert(1);
filter: brightness(0) invert(1);
}
<p>
Original:
<img src="http:...
Storing Image Data for offline web application (client-side storage database)
I have an offline web application using appcaching. I need to provide it about 10MB - 20MB of data that it will save (client-side) consisting mainly of PNG image files. The operation is as follows:
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Why git can't remember my passphrase under Windows
...elevated and my git host is github and i have create a ssh key like that guide on github
11 Answers
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Cluster analysis in R: determine the optimal number of clusters
...uld be indicated by this method:
Two. You can do partitioning around medoids to estimate the number of clusters using the pamk function in the fpc package.
library(fpc)
pamk.best <- pamk(d)
cat("number of clusters estimated by optimum average silhouette width:", pamk.best$nc, "\n")
plot(pam(d...
How to create the branch from specific commit in different branch
...ev. Branching out from a commit of master (older than the merge) won't provide you with the changes of dev.
If you want to permanently integrate new changes from master into your feature branches, you should merge master into them and go on. This will create merge commits in your feature branches...
Perform debounce in React.js
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2018: try promise debouncing
We often want to debounce API calls to avoid flooding the backend with useless requests.
In 2018, working with callbacks (Lodash/Underscore) feels bad and error-prone to me. It's easy to encounter boilerplate and concurrency issues due to API calls resolving in an a...