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Paste multiple columns together
...e matrix conversion. Also, instead a for loop we could just use setdiff in order to remove unwanted columns
cols <- c('b','c','d')
data$x <- Reduce(function(...) paste(..., sep = "-"), data[cols])
data[setdiff(names(data), cols)]
# a x
# 1 1 a-d-g
# 2 2 b-e-h
# 3 3 c-f-i
Alternative...
Running JAR file on Windows
I have a JAR file named helloworld.jar .
In order to run it, I'm executing the following command in a command-line window:
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Python pandas: fill a dataframe row by row
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Including all the jars in a directory within the Java classpath
...AR files in a single directory foo, use either
foo;foo/* or foo/*;foo. The order chosen determines whether the
classes and resources in foo are loaded before JAR files in foo, or
vice versa.
Subdirectories are not searched recursively. For example, foo/* looks
for JAR files only in foo, not in foo/b...
Convert Array to Object
...completeness, reduceRight allows you to iterate over your array in reverse order:
[{ a: 1},{ b: 2},{ c: 3}].reduceRight(/* same implementation as above */)
will produce: {c:3, b:2, a:1}
Your accumulator can be of any type for you specific purpose. For example in order to swap the key and value o...
How do you get a list of the names of all files present in a directory in Node.js?
... @user3705055 unless you're using gulp to read in a directory of source order dependant files and compile them into a single executable.
– r3wt
Apr 7 '16 at 20:59
3
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How do you run your own code alongside Tkinter's event loop?
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Print string to text file
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How to merge YAML arrays?
...l caveats to YAML anchors and aliases apply for uniqueness and declaration order
Conclusion
This approach allows creation of merged lists by use of the alias and anchor feature of YAML.
Although the output result is a nested list of lists, this can be easily transformed using the flatten method....
Sequelize.js: how to use migrations and sync
...igration that you are talking about. All you have to do is to call sync in order to create the tables.
sequelize.sync()
You can also run a simple model synchronization by doing something like:
Project.sync() but I think that sequelize.sync() is a more useful general case for your project (as long...