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Find MongoDB records where array field is not empty
... two things when querying - accuracy and performance. With that in mind, I tested a few different approaches in MongoDB v3.0.14.
TL;DR db.doc.find({ nums: { $gt: -Infinity }}) is the fastest and most reliable (at least in the MongoDB version I tested).
EDIT: This no longer works in MongoDB v3.6! S...
Test if a class has an attribute?
I'm trying to do a little Test-First development, and I'm trying to verify that my classes are marked with an attribute:
4 ...
Meaning of “[: too many arguments” error from if [] (square brackets)
...aracters, and single square brackets are used (which is a shortcut for the test command), then the string may be split out into multiple words. Each of these is treated as a separate argument.
So that one variable is split out into many arguments:
VARIABLE=$(/some/command);
# returns "hello wor...
Most efficient way to concatenate strings in JavaScript?
...to it and then do a join. Can anyone explain and give an example of the fastest way to do this?
4 Answers
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How to run a JAR file
...e demonstration, but here's another one from scratch. You need two files:
Test.java:
public class Test
{
public static void main(String[] args)
{
System.out.println("Hello world");
}
}
manifest.mf:
Manifest-version: 1.0
Main-Class: Test
Note that the text file must end wit...
Meteor test driven development [closed]
I don't see how to do test driven development in meteor.
13 Answers
13
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Object comparison in JavaScript [duplicate]
...ection
functions may have identical text but refer to different closures
Tests: passes tests are from How to determine equality for two JavaScript objects?.
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How can I parse a CSV string with JavaScript, which contains comma in data?
...st value when that value is empty. This special "empty last value" case is tested for and handled by the JavaScript function which follows.
JavaScript function to parse CSV string:
// Return array of string values, or NULL if CSV string not well formed.
function CSVtoArray(text) {
var re_valid =...
How to set target hosts in Fabric file
...is by declaring an actual function for each environment. For example:
def test():
env.user = 'testuser'
env.hosts = ['test.server.com']
def prod():
env.user = 'produser'
env.hosts = ['prod.server.com']
def deploy():
...
Using the above functions, I would type the following t...
How is the Linux kernel tested ?
How do the Linux kernel developers test their code locally and after they have it committed? Do they use some kind of unit testing, build automation? test plans?
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