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How to create streams from string in Node.Js?
...ng"])
readable.on("data", (chunk) => {
console.log(chunk) // will be called once with `"input string"`
})
Note that at least between 10.17 and 12.3, a string is itself a iterable, so Readable.from("input string") will work, but emit one event per character. Readable.from(["input string"]) wi...
How to do a JUnit assert on a message in a logger
I have some code-under-test that calls on a Java logger to report its status.
In the JUnit test code, I would like to verify that the correct log entry was made in this logger. Something along the following lines:
...
Simulate CREATE DATABASE IF NOT EXISTS for PostgreSQL?
...nt to be executed.
Workaround from the shell
With \gexec you only need to call psql once:
echo "SELECT 'CREATE DATABASE mydb' WHERE NOT EXISTS (SELECT FROM pg_database WHERE datname = 'mydb')\gexec" | psql
You may need more psql options for your connection; role, port, password, ... See:
Run batc...
map function for objects (instead of arrays)
...because it isn't doing a return - it's abusing map as if it were a forEach call. If he actually did return myObject[value] * 2 then the result would be an array containing the original values doubled, instead of an object containing the original keys with doubled values, the latter clearly being wh...
How to set a default value with Html.TextBoxFor?
...e Html.TextBoxFor method, my first guess was to try the following which did not work:
12 Answers
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MongoDB: How to update multiple documents with a single command?
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didn't worked db.userActivity.find({ 'appId' : 1234, 'status' : 1}).update({ $set: { 'status': 1 } }); 2017-06-05T17:47:10.038+0530 E QUERY [thread1] TypeError: db.userActivity.find(...).update is not a function :
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What is the purpose of the word 'self'?
... way that makes the instance to which the method belongs be passed automatically, but not received automatically: the first parameter of methods is the instance the method is called on. That makes methods entirely the same as functions, and leaves the actual name to use up to you (although self is t...
Generic TryParse
...ndler<T>(string value, out T result);
Then it's simply a matter of calling thusly:
var value = TryParse<int>("123", int.TryParse);
var value2 = TryParse<decimal>("123.123", decimal.TryParse);
share
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Where am I? - Get country
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You may want to change the toLowerCase() call to toUpperCase().
– toobsco42
May 19 '16 at 8:07
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Better way to shuffle two numpy arrays in unison
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Your "scary" solution does not appear scary to me. Calling shuffle() for two sequences of the same length results in the same number of calls to the random number generator, and these are the only "random" elements in the shuffle algorithm. By resetting the state, you ensure...