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Arduino101（Genuino 101）&App Inventor – RGB LED控制 - 创客硬件开...
...; // BLE AnalogRead Service
// BLE LED Switch Characteristic - custom 128-bit UUID, read and writable by central
BLEUnsignedIntCharacteristic LEDStatus("19B10011-E8F2-537E-4F6C-D104768A1214", BLERead | BLEWrite );
int incom = 0;
int r, g, b ;
void setup() {
Serial...
Database sharding vs partitioning
...ty reasons, as for load balancing.
https://en.wikipedia.org/wiki/Partition_(database)
Sharding is a type of partitioning, such as Horizontal Partitioning (HP)
There is also Vertical Partitioning (VP) whereby you split a table into smaller distinct parts. Normalization also involves this splitting...
Check if object exists in JavaScript
... as this will also reported to be the type of object which may leave you a bit confused. Not to mention that typeof null will also give you object which is simply wrong.
The primal area where you really should be careful about typeof, undefined, null, unknown and other misteries are host objects. T...
grep a file, but show several surrounding lines?
...nd placed into a directory listed in the $PATH (and its eXecute permission bit set), it should work right away. (No sudo or root privileges are required to get ack to work.)
– J-L
Nov 12 '18 at 17:41
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Random date in C#
...
I am a bit late in to the game, but here is one solution which works fine:
void Main()
{
var dateResult = GetRandomDates(new DateTime(1995, 1, 1), DateTime.UtcNow, 100);
foreach (var r in dateResult)
...
Random record from MongoDB
I am looking to get a random record from a huge (100 million record) mongodb .
26 Answers
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How to join multiple lines of file names into one with custom delimiter?
... Do you have some more information regarding how set works? Looks a bit like voodoo to me. shallow look through man set didn't net me much information either.
– Ehtesh Choudhury
Sep 12 '13 at 18:08
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How to prevent ifelse() from turning Date objects into numeric objects
...
You may use data.table::fifelse (data.table >= 1.12.3) or dplyr::if_else.
data.table::fifelse
Unlike ifelse, fifelse preserves the type and class of the inputs.
library(data.table)
dates <- fifelse(dates == '2011-01-01', dates - 1, dates)
str(dates)
# Date[1:5], format: "2010-12-31" "2...
std::string to float or double
...th Boost (linking with Boost only to convert a std::string to numbers is a bit overkill !)
– Jean-Philippe Jodoin
Jul 22 '14 at 17:40
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SQL Server equivalent to Oracle's CREATE OR REPLACE VIEW
...myView'
GO
CREATE View myView
...
GO
I think it makes my changescripts a bit more readable
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