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Mongodb Explain for Aggregation framework
... new aggregation stages and expressions including support for working with arrays, strings, and facets.
There are also a number of Aggregation Pipeline Optimizations that automatically happen depending on your MongoDB server version. For example, adjacent stages may be coalesced and/or reordered ...
What exactly does Perl's “bless” do?
...er what the reference is to, it can be to a hash (most common case), to an array (not so common), to a scalar (usually this indicates an inside-out object), to a regular expression, subroutine or TYPEGLOB (see the book Object Oriented Perl: A Comprehensive Guide to Concepts and Programming Technique...
What is a “thread” (really)?
...the computations.
EDIT: (Computations like adding two numbers, sorting an array, basically executing the code that has been written)
Now moving on to the definition of a thread.
A thread is a basic unit of CPU utilization; it comprises a thread ID, a program
counter, a register set, and a ...
arrayfun can be significantly slower than an explicit loop in matlab. Why?
Consider the following simple speed test for arrayfun :
2 Answers
2
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Turn a number into star rating display using jQuery and CSS
... {
var rating = $(this).data("rating");
var fullStar = new Array(Math.floor(rating + 1)).join('<i class="fas fa-star"></i>');
var halfStar = ((rating%1) !== 0) ? '<i class="fas fa-star-half-alt"></i>': '';
var noStar = new Array(Math.floor($(th...
C++ templates Turing-complete?
...not have to match runtime floating point arithmetics:
bool f(){
char array[1+int(1+0.2-0.1-0.1)]; //Must be evaluated during translation
int size=1+int(1+0.2-0.1-0.1); //May be evaluated at runtime
return sizeof(array)==size;
}
It is unspecified whether the value of f() will be...
Create Generic method constraining T to an Enum
...uetype [mscorlib]System.RuntimeTypeHandle)
call class [mscorlib]System.Array [mscorlib]System.Enum::GetValues(class [mscorlib]System.Type)
callvirt instance class [mscorlib]System.Collections.IEnumerator [mscorlib]System.Array::GetEnumerator()
stloc enumerator
.try
{
CONDI...
fastest MD5 Implementation in JavaScript
...ncremental mode. It doesn't have Base64 o/p but it does have raw o/p (i.e. array of 32-bit int insead of string).
JQuery MD5 plugin: Very simple down to earth but doesn't seem to have raw mode.
JavaScript-MD5: Not as fancy or fast as Spark but simpler.
Example from CryptoJS:
//just include md5.js...
How to generate the “create table” sql statement for an existing table in postgreSQL
...
'CREATE TABLE ' || relname || E'\n(\n' ||
array_to_string(
array_agg(
' ' || column_name || ' ' || type || ' '|| not_null
)
, E',\n'
) || E'\n);\n'
from
(
SELECT
c.relname, a.attname AS column_name,
pg_catalog.format_type(a.atttypid...
How can I store my users' passwords safely?
...ou need (for example by specifying a "cost" parameter through the $options array)
<?php
var_dump(password_hash("my-secret-password", PASSWORD_DEFAULT));
$options = array(
'cost' => 7, // this is the number of rounds for bcrypt
// 'salt' => 'TphfsM82o1uEKlfP9vf1f', // you could spe...