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How do I get a class instance of generic type T?
...t<T> for ArrayList<T> or GenericDAO<T> for DAO<T>, etc.
Pure Java solution
The article Accessing generic types at runtime in Java explains how you can do it using pure Java.
@SuppressWarnings("unchecked")
public GenericJpaDao() {
this.entityBeanType = ((Class) ((Paramete...
Git: “Corrupt loose object”
...but all the local changes are still there. git status, commit, pull, push, etc. work again as they should.
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Get name of current script in Python
...his will print foo.py for python foo.py, dir/foo.py for python dir/foo.py, etc. It's the first argument to python. (Note that after py2exe it would be foo.exe.)
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Node.js - Find home directory in platform agnostic way
...ization in terms of trailing slashes, potentially odd forward/backslashes, etc... (especially if you got file operations in mind, after getting this info)
– Frank Nocke
Oct 16 '17 at 12:37
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Paste multiple times
...lines (using . to great effect), then the second edit on a bunch of lines, etc. Alternatively, the use of macros may help as they are fantastic, but sometimes a little more tedious to get working correctly with "complex" changes.
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Use gulp to select and move directories and their files
...arches recursively throughout all subfolders, and subfolders' subfolders', etc.
Filename.extension asterisks (.../*.*) finds files of all names, and all extensions. So I think this part deserves the most emphasis!
The accepted answer changes something else; it adds a prefix of ./ to each path argum...
data.table vs dplyr: can one do something well the other can't or does poorly?
...ll become a column in result. You can use c(), as.list(), lapply(), list() etc... base functions to accomplish this, without having to learn any new functions.
You will need to learn just the special variables - .N and .SD at least. The equivalent in dplyr are n() and .
Joins
dplyr provides s...
How to run Node.js as a background process and never die?
... settings
# using an ecosystem.json file (with env variables, custom args, etc):
$ pm2 start ecosystem.json
One big advantage I see in favor of PM2 is that it can generate the system startup script to make the process persist between restarts:
$ pm2 startup [platform]
Where platform can be ubun...
How to find where gem files are installed
...ronment Display information about the RubyGems environment
fetch Download a gem and place it in the current directory
generate_index Generates the index files for a gem server directory
help Provide help on the 'gem' command
insta...
Java 8 Stream and operation on arrays
...o convert an array into a Java 8 stream which can then be used for summing etc.
int sum = Arrays.stream(myIntArray)
.sum();
Multiplying two arrays is a little more difficult because I can't think of a way to get the value AND the index at the same time as a Stream operation. Th...