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How to efficiently concatenate strings in go
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If you have a string slice that you want to efficiently convert to a string then you can use this approach. Otherwise, take a look at the other answers.
There is a library function in the strings package called Join:
http://golang.org/pkg/strings/#Join
A look at the code of Join s...
常用Linux命令详解（持续更新） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...s
NRU_CMU_DISK_SIZE_NOTIFY2008 anaconda-ks.cfg install.log install.log.syslog
显示名称以“.”开头的隐藏文件
[root@KEDACOM ~]# ls -a
.bash_histor .bash_profile .cshrc .ssh NRU_CMU_DISK_SIZE_NOTIFY2008 install.log .bash_logout .mysql_history.TMP .tcshrc anaconda-ks.cfg
显示...
Calculate distance between 2 GPS coordinates
...s and seconds are out of 60 so S31 30' is -31.50 degrees.
Don't forget to convert degrees to radians. Many languages have this function. Or its a simple calculation: radians = degrees * PI / 180.
function degreesToRadians(degrees) {
return degrees * Math.PI / 180;
}
function distanceInKmBetwe...
Using current time in UTC as default value in PostgreSQL
...low link and search the page for UTC. On input, a timestamp with time zone converts the incoming value to utc and stores that value WITH NO TIME ZONE OR OFFSET INFORMATION. On output, the stored utc value is converted to a local time using time zone of the client if available. This type is all abou...
How do I drop a foreign key in SQL Server?
...ck of existence of the constraint then drop it.
if exists (select 1 from sys.objects where name = 'Company_CountryID_FK' and type='F')
begin
alter table company drop constraint Company_CountryID_FK
end
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Locate Git installation folder on Mac OS X
I'm just curious, Where Git get installed (via DMG) on Mac OS X file system?
11 Answers
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How do you calculate program run time in python? [duplicate]
...he execution of an entire script, you can run it under time on a unix-like system.
kotai:~ chmullig$ cat sleep.py
import time
print "presleep"
time.sleep(10)
print "post sleep"
kotai:~ chmullig$ python sleep.py
presleep
post sleep
kotai:~ chmullig$ time python sleep.py
presleep
post sleep
real...
find first sequence item that matches a criterion [duplicate]
...his affect readability? E.g. first non-path arugment: next((arg for arg in sys.argv if not os.path.exists(arg)), None) - not very friendly.
– Tomasz Gandor
Mar 18 '16 at 11:38
4
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How do I write a Python dictionary to a csv file? [duplicate]
...Pro tip: When developing code like this, set the writer to w = csv.writer(sys.stderr) so you can more easily see what is being generated. When the logic is perfected, switch back to w = csv.writer(f).
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Allowing specific values for an Argparse argument [duplicate]
... help='Special testing value')
args = parser.parse_args(sys.argv[1:])
See the docs for more details.
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