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mongo group query how to keep fields
...$first: '$age' }, // retain remaining field
count: { $sum: 1 } // count based on your group
},
{
$project:{
name:"$_id.name",
age: "$age",
count: "$count",
_id:0
}
}])
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What is the common header format of Python files?
...n Python 2.1, Unicode literals can only be written using the
Latin-1 based encoding "unicode-escape". This makes the
programming environment rather unfriendly to Python users who live
and work in non-Latin-1 locales such as many of the Asian
countries. Programmers can write ...
Declare and initialize a Dictionary in Typescript
...fied once generics are available in the 0.9 release.
First we declare the base Dictionary class and Interface. The interface is required for the indexer because classes cannot implement them.
interface IDictionary {
add(key: string, value: any): void;
remove(key: string): void;
contain...
Proper Repository Pattern Design in PHP?
...g to use the repository pattern in an MVC architecture with relational databases.
11 Answers
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What is the difference between ndarray and array in numpy?
...t says false. but with np.ndarrray() when you specify the order it creates based on the order provided.
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`new function()` with lower case “f” in JavaScript
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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Javascript : natural sort of alphanumerical strings
...smartly recognize numbers. You can do case-insensitive using sensitivity: 'base'. Tested in Chrome, Firefox, and IE11.
Here's an example. It returns 1, meaning 10 goes after 2:
'10'.localeCompare('2', undefined, {numeric: true, sensitivity: 'base'})
For performance when sorting large numbers of ...
How can I output leading zeros in Ruby?
...
Came here for how to pad a base 36 number. This works for that, whereas % looks like it won't. Thanks!
– Ethan Kaminski
Jan 10 '17 at 9:52
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How to get a time zone from a location using latitude and longitude coordinates?
...nt libraries for just about everything
Self-hosted web services
geo2tz - based on Timezone lookup, available via Docker image
Other Ideas
Find the nearest city with an R-Tree
Find the nearest city with MySQL
Please update this list if you know of any others
Also, note that the nearest-city appr...
Shards and replicas in Elasticsearch
... your index. The general formula to calculate the number of nodes required based on replicas and shards is "number of nodes = number of shards*(number of replicas + 1)".The standard practice is to have atleast one replica for fault tolerance.
Setting up the number of shards is a static operation, m...