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How do I perform the SQL Join equivalent in MongoDB?
...r objects in a single query. But MongoDB does not support joins and so, at times, requires bit of denormalization. Here, this means caching the 'username' attribute.
Relational purists may be feeling uneasy already, as if we were violating some universal law. But let’s bear in mind that MongoDB co...
Merge and interleave two arrays in Ruby
...he;s working with. consider: [].zip[1, 2] => nil (going to have a hard time calling #flatten on that) [3,4].zip([1, 3, 5, 7]) => [[3, 1], [4, 3]] (oops, guess we don't care about the last few elements in the 2nd array)
– hoff2
Jan 22 '14 at 22:13
...
Java String - See if a string contains only numbers and not letters
...rations and 5 test iterations.
Results
Note that parseLong is almost 100 times slower than isDigit for first test load.
## Test load with 25% valid strings (75% strings contain non-digit symbols)
Benchmark Mode Cnt Score Error Units
testIsDigit thrpt 5 9.275 ± 2.348 ops/s
tes...
How does the compilation/linking process work?
...ch is why it must be used with care.
It works on one C++ source file at a time by replacing #include directives with the content of the respective files (which is usually just declarations), doing replacement of macros (#define), and selecting different portions of text depending of #if, #ifdef and...
How to wait until an element exists?
...aram {function|string} handler
* A function to execute at the time when the element is inserted or
* string "remove" to remove the listener from the given selector
* @param {bool} shouldRunHandlerOnce
* Optional: if true, handler is unbound after its first inv...
How to implement a rule engine?
...notified of failure or success.
Generating an in-memory assembly is a 1-time occurrence during your application and you get a performance gain by not having to use reflection when evaluating your rules. Your expressions are checked at runtime as the assembly will not generate correctly if a prop...
How do I match any character across multiple lines in a regular expression?
...gt;
It basically says "any character or a newline" repeated zero or more times.
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Custom events in jQuery?
...ectivity has been lost, or the server is simply unreachable at the current time.
$.networkDetection = function(url,interval){
var url = url;
var interval = interval;
online = false;
this.StartPolling = function(){
this.StopPolling();
this.timer = setInterval(poll, in...
How to output numbers with leading zeros in JavaScript [duplicate]
...
According to this benchmark, this method is 5 times slower than the accepted solution: gist.github.com/4382935
– andrewrk
Dec 26 '12 at 20:36
2
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Docker build “Could not resolve 'archive.ubuntu.com'” apt-get fails to install anything
...e problem:
$ docker run --rm busybox nslookup google.com # takes a long time
nslookup: can't resolve 'google.com' # <--- appears after a long time
Server: 8.8.8.8
Address 1: 8.8.8.8
If the command appears to hang, but eventually spits out the error "can't resolve 'google.com'", then you...