大约有 13,700 项符合查询结果（耗时：0.0095秒） [XML]
Does using “new” on a struct allocate it on the heap or stack?
...erisedCtorAssignToField() cil managed
{
.maxstack 8
L_0001: ldstr ""
L_0006: newobj instance void [mscorlib]System.Guid::.ctor(string)
L_000b: stsfld valuetype [mscorlib]System.Guid Test::field
L_0010: ret
}
.method private hidebysig static v...
Why is using the rails default_scope often recommend against?
... when wanting to show unpublished (private) posts. So far so good.
2.1.1 :001 > Post.all
Post Load (0.2ms) SELECT "posts".* FROM "posts" WHERE "posts"."published" = 't'
Well this is pretty much what we expect. Now lets try:
2.1.1 :004 > Post.new
=> #<Post id: nil, title: nil, p...
Select random row from a sqlite table
...qlite> select count(*) from payment;
16049
Run Time: real 0.000 user 0.000140 sys 0.000117
sqlite> select payment_id from payment limit 1 offset abs(random()) % (select count(*) from payment);
14746
Run Time: real 0.002 user 0.000899 sys 0.000132
sqlite> select payment_id from payment limi...
Get week of year in JavaScript like in PHP
... Also, doesn't this technically not advance the week until 0:00:00.001? Better to use Math.floor?
– Hafthor
Feb 17 '16 at 16:20
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How to sort a Ruby Hash by number value?
...
That's not the behavior I'm seeing:
irb(main):001:0> metrics = {"sitea.com" => 745, "siteb.com" => 9, "sitec.com" =>
10 }
=> {"siteb.com"=>9, "sitec.com"=>10, "sitea.com"=>745}
irb(main):002:0> metrics.sort {|a1,a2| a2[1]<=>a1[1]}
=> ...
How to detect if a script is being sourced
...WN SUBSHELL:
> HISTCMD=0
> PPID=9725
> RANDOM=1626
> SECONDS=0.001
> lineno=0
> SHLVL=3
diff /tmp/ksh-{9725,9781}.log | grep ^\< # SOURCED:
< COLUMNS=152
< HISTCMD=117
< LINES=47
< PPID=9163
< PS1='$ '
< RANDOM=29667
< SECONDS=23.652
< level=1
< ...
Start / Stop a Windows Service from a non-Administrator user account
...for this. For example, if I wanted to give the user job on the computer VMX001 the ability to start and stop the World Wide Web Publishing Service (also know as w3svc), I would issue the following command as an Administrator:
subinacl.exe /service w3svc /grant=VMX001\job=PTO
The permissions you ca...
Powershell equivalent of bash ampersand (&) for forking/running background processes
...ve. The args are passed as an array:
$1 = start -n powershell pinger,comp001 -pa
What is dynamic programming? [closed]
...ng process, but what if I give you the results for n=1,000,000 and n=1,000,001? Suddenly the problem just became more manageable.
Dynamic programming is used a lot in string problems, such as the string edit problem. You solve a subset(s) of the problem and then use that information to solve the mo...