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MongoDB Aggregation: How to get total records count?
I have used aggregation for fetching records from mongodb.
13 Answers
13
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Check Whether a User Exists
...purposes, and while not de facto, align with the variable name I have used from a boolean perspective also: stackoverflow.com/a/5431932/3051627 . stackoverflow.com/questions/2933843/… .
– Pancho
Aug 31 '16 at 18:53
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How to dynamically create generic C# object using reflection? [duplicate]
...CreateInstance(makeme) as ITask;
// This can be Item, or any type derived from Item
task.Process(new Item());
In any case, you won't be statically cast to a type you don't know beforehand ("makeme" in this case). ITask allows you to get to your target type.
If this is not what you want, you'll p...
What's HTML character code 8203?
...o know this is the solution they are looking for when trying to clean text from quirky systems. when i say quirky i mean Microsoft 360 free website garbage! i'm very good with regular expressions having years of experience, but it just doesn't really matter when you encounter something you don't kno...
git diff two files on same branch, same commit
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This worked for me, just comparing file names from two different directories: git diff --name-only HEAD:dir1 HEAD:dir1_backup works after a git add of both directories.
– Frank Forte
Feb 13 '18 at 18:41
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how to convert java string to Date object [duplicate]
...teFormat df = new SimpleDateFormat("MM/dd/yyyy");
// Convert from String to Date
Date startDate = df.parse(startDateString);
// Print the date, with the default formatting.
// Here, the important thing to note is that the parts of the date
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how to get GET and POST variables with JQuery?
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For GET parameters, you can grab them from document.location.search:
var $_GET = {};
document.location.search.replace(/\??(?:([^=]+)=([^&]*)&?)/g, function () {
function decode(s) {
return decodeURIComponent(s.split("+").join(" "));
}
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How to convert jsonString to JSONObject in Java
...ult in infinite recursion.
(Deserialization)
BagOfPrimitives obj2 = gson.fromJson(json, BagOfPrimitives.class);
==> obj2 is just like obj
Another example for Gson:
Gson is easy to learn and implement, you need to know is the following two methods:
-> toJson() – convert java object to...
How to determine the screen width in terms of dp or dip at runtime in Android?
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I stumbled upon this question from Google, and later on I found an easy solution valid for API >= 13.
For future references:
Configuration configuration = yourActivity.getResources().getConfiguration();
int screenWidthDp = configuration.screenWidthDp...
Checking if all elements in a list are unique
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Alternative to a set, you can use a dict.
len({}.fromkeys(x)) == len(x)
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