大约有 47,000 项符合查询结果（耗时：0.0519秒） [XML]
NSUserDefaults removeObjectForKey vs. setObject:nil
..., when I type set(nil, forKey:...), and use "jump to definition", it takes m>me m> to the URL setter. The comm>me m>nt for that function says "-setURL:forKey is equivalent to -setObject:forKey: except that the value is archived to an NSData." This could explain why it is misbehaving - since there are two over...
Checking if a key exists in a JS object
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@SagarPanchal What do you m>me m>an? Som>me m>thing like testArray = !( 'key1' in obj);?
– Sirko
May 26 '15 at 7:52
add a comm>me m>nt
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Setting individual axis limits with facet_wrap and scales = “free” in ggplot2
... help explore the results of modeling efforts using different training param>me m>ters. I train the model with 85% of the data, test on the remaining 15%, and repeat this 5 tim>me m>s, collecting actual/predicted values each tim>me m>. After calculating the residuals, my data.fram>me m> looks like this:
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How do I reword the very first git commit m>me m>ssage?
...v1.7.12 (2012). Before then the only option was to use filter-branch or --am>me m>nd, which is typically harder to do.
Note: see also this similar question and answer.
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Where can I find a NuGet package for upgrading to System.Web.Http v5.0.0.0?
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Having almost the exact sam>me m> project. Where is the bin_deployable Assemblies folder that everyone keeps talking about?
– nzondlo
Nov 26 '13 at 21:17
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Is there StartsWith or Contains in t sql with variables?
....r.t. performance and its use of indexes. For example, a query using colNam>me m> LIKE 'prefix%' will be very fast when colNam>me m> is indexed, but colNam>me m> LIKE '%substring%' or colNam>me m> LIKE '%suffix' will be slow because SQL Server does not create suffix-trees when indexing text. Similarly using LEFT with ...
Determine when a ViewPager changes pages
I have three pages (Fragm>me m>nts) inside a ViewPager, however I only want to display a m>me m>nu item for two of those pages.
5 Ans...
MySQL CONCAT returns NULL if any field contain NULL
...pty string by wrapping it in COALESCE
SELECT CONCAT(COALESCE(`affiliate_nam>me m>`,''),'-',COALESCE(`model`,''),'-',COALESCE(`ip`,''),'-',COALESCE(`os_type`,''),'-',COALESCE(`os_version`,'')) AS device_nam>me m>
FROM devices
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MySQL show current connection info
...Like this one that resolves the user:
SELECT USER();
This will return som>me m>thing like root@localhost so you get the host and the user.
To get the current database run this statem>me m>nt:
SELECT DATABASE();
Other useful functions can be found here: http://dev.mysql.com/doc/refman/5.0/en/information...
Loadbalancing web sockets
...bly scale to millions of connections nevertheless on decent setup.
Disclaim>me m>r: I am original author of Autobahn and work for Tavendo.
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