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Check synchronously if file/directory exists in Node.js
...ynchronous version of stat; lstatSync is the synchronous version of lstat, etc.
lstatSync tells you both whether something exists, and if so, whether it's a file or a directory (or in some file systems, a symbolic link, block device, character device, etc.), e.g. if you need to know if it exists an...
Create a unique number with javascript time
...tDate < 10) ? '0' : '') + now.getDate().toString(); // pad with a 0
... etc... with .getHours(), getMinutes(), getSeconds(), getMilliseconds()
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TCP 的那些事儿（上） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...些事儿（上）TCP是一个巨复杂的协议，因为他要解决很多问题，而这些问题又带出了很多子问题和阴暗面。所以学习TCP本身是个比较痛苦的过程，但对于学习的...
TCP是一个巨复杂的协议，因为他要解决很多问题，而这些问题又...
Getting a list of values from a list of dicts
...key values from list of dictionaries in python?
Ex:
data =
[{'obj1':[{'cpu_percentage':'15%','ram':3,'memory_percentage':'66%'}]},
{'obj2': [{'cpu_percentage':'0','ram':4,'memory_percentage':'35%'}]}]
for d in data:
for key,value in d.items():
z ={key: {'cpu_percentage': d['cpu_per...
Is there any difference between GROUP BY and DISTINCT
....
Here are the most important operations:
FROM (including JOIN, APPLY, etc.)
WHERE
GROUP BY (can remove duplicates)
Aggregations
HAVING
Window functions
SELECT
DISTINCT (can remove duplicates)
UNION, INTERSECT, EXCEPT (can remove duplicates)
ORDER BY
OFFSET
LIMIT
As you can see, the logical or...
What is LDAP used for?
...ntain by network administrators. For example you can:
use the same login/passwd to login on an Intranet and on your local computer.
give specific permissions to a group of user. For example some could access some specific page of your Intranet, or some specific directories on a shared drive.
get a...
How can I determine if a .NET assembly was built for x86 or x64?
...ou need to seek to determine if the 32BIT flag is set to 1 (x86) or 0 (Any CPU or x64, depending on PE):
Option | PE | 32BIT
----------|-------|---------
x86 | PE32 | 1
Any CPU | PE32 | 0
x64 | PE32+ | 0
The blog post x64 Development with .NET has some information about corf...
家政O2O百家争鸣后的卡位战：烧钱补贴并非良药 - 资讯 - 清泛网 - 专注IT技能提升
...少业内人士表示，今年或将迎来真正的家政O2O大战，那么问题来了，怎么战？融资后的钱是否仅有补贴一道？
未来存活率仅有5%
国内巨大的家政需求吸引着一系列创业者的关注，根据“云家政”去年年底发布的北上广深四地家...
家政O2O百家争鸣后的卡位战：烧钱补贴并非良药 - 资讯 - 清泛网 - 专注IT技能提升
...少业内人士表示，今年或将迎来真正的家政O2O大战，那么问题来了，怎么战？融资后的钱是否仅有补贴一道？
未来存活率仅有5%
国内巨大的家政需求吸引着一系列创业者的关注，根据“云家政”去年年底发布的北上广深四地家...
家政O2O百家争鸣后的卡位战：烧钱补贴并非良药 - 资讯 - 清泛网 - 专注IT技能提升
...少业内人士表示，今年或将迎来真正的家政O2O大战，那么问题来了，怎么战？融资后的钱是否仅有补贴一道？
未来存活率仅有5%
国内巨大的家政需求吸引着一系列创业者的关注，根据“云家政”去年年底发布的北上广深四地家...