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javascript set a variable if undefined
...100% of the time, not just 98%. The advantage of === being it is easier to read, especially at a glance, shorter and avoids an unnecessary method call. Personally I would only use Object.is() when the situation requires it and prefer === in all other cases.
– blubberdiblub
...
How to extract a git subdirectory and make a submodule out of it?
...e is now part of git (if you install contrib) as of 1.7.11, so you might already have it installed. You may check by executing git subtree.
To install git-subtree from source (for older versions of git):
git clone https://github.com/apenwarr/git-subtree.git
cd git-subtree
sudo rsync -a ./git-su...
Non-Relational Database Design [closed]
... and therefore the conceptual data design will also differ a lot. In the thread Data Design in Non-Relational Databases of the NOSQL Google group the different paradigms are categorized like this:
Bigtable-like systems (HBase,
Hypertable, etc)
Key-value stores (Tokyo, Voldemort,
etc)
Document data...
How can I handle time zones in my webapp?
...py New Year", could be sent to all users of the web app. Since users are spread out world wide, we needed to display the notification according to the timezone. Storing timestamp in UTC nicely served our purpose, without hiccups.
In your use case, if you're not storing the user timezone somewhere y...
What are queues in jQuery?
...ions using .dequeue().
To understand the internal jQuery queue functions, reading the source and looking at examples helps me out tremendously. One of the best examples of a queue function I've seen is .delay():
$.fn.delay = function( time, type ) {
time = jQuery.fx ? jQuery.fx.speeds[time] || ...
How to compare arrays in JavaScript?
...eference for more info about the comparison operators).
UPDATE
From what I read from the comments, sorting the array and comparing may give accurate result:
const array2Sorted = array2.slice().sort();
array1.length === array2.length && array1.slice().sort().every(function(value, index) {
...
Why do C++ libraries and frameworks never use smart pointers?
I read in a few articles that raw pointers should almost never be used. Instead they should always be wrapped inside smart pointers, whether it's scoped or shared pointers.
...
Difference between git checkout --track origin/branch and git checkout -b branch origin/branch
...at is, as commented by Sebastian Graf, if the local branch did not exist already.
If it did, you would need git checkout -B abranch origin/abranch)
Note: with Git 2.23 (Q3 2019), that would use the new command git switch:
git switch -c <branch> --track <remote>/<branch>
If...
What's the scope of the “using” declaration in C++?
...d the five character std:: prefix adds a lot of line length - which I find reads worse. So I was wondering if a using directive within the namespace containing the class was ok? (Even if within a header.)
– thomthom
Dec 15 '13 at 9:37
...
C++实现一款简单完整的聊天室服务器+客户端 - C/C++ - 清泛网 - 专注C/C++及内核技术
...#ifndef _MESSAGE_BUF_INCLUDE_
#define _MESSAGE_BUF_INCLUDE_
#include <pthread.h>
#define MESSAGE_COUNT 16
#define MESSAGE_LENGTH 2048
class MessageBuffer{
private:
pthread_mutex_t mutex;//访问缓冲的互斥量
pthread_cond_t condition;//访问缓冲区的条件变量
//消息缓冲...