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?: operator (the 'Elvis operator') in PHP
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Be careful with arrays. We must write a checking variable after ?, because:
$params = ['param1' => 'value1',
'param2' => 'value2',
'param3' => 'value3',];
$param1 = isset($params['param1'])?:null;
$...
创业第一年 太特么累了 - 资讯 - 清泛网 - 专注C/C++及内核技术
...有的直接影响到运营推广。举个栗子，我们的应用上线后使用还算流畅，但后来发现有的手机特别卡，试了半天总结出安卓5.0以上都这毛病，找原因吧。。。呵呵，到现在也没找到！技术总监已咬碎牙准备换框架了。还有与外包...
Map implementation with duplicate keys
...ogle.common.collect.HashMultimap has readObject/writeObject methods, as do ArrayListMultimap and Immutable{List,Set}Multimap. I would consider a useless deserialized instance a bug worth reporting.
– nd.
Jul 25 '14 at 6:02
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How to put a line comment for a multi-line command [duplicate]
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You could store the arguments in an array:
args=(InputFiles # This is the comment for the 1st line
# You can have whole lines of comments in between, useful for:
#--deprecated-option # This isn't use any more
--option1 arg1 # This is th...
How to use the 'sweep' function
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One use is when you're computing weighted sums for an array. Where rowSums or colSums can be assumed to mean 'weights=1', sweep can be used prior to this to give a weighted result. This is particularly useful for arrays with >=3 dimensions.
This comes up e.g. when calculatin...
How do I Geocode 20 addresses without receiving an OVER_QUERY_LIMIT response?
...e stored the lat/long into the DB and retrieving it from DB via AJAX as an array, but it should then passed again to a java script loop, more over i have received 173 locations from DB. Now it shows me the same OVER_QUERY_LIMIT status. Please advice...
– Prabhu M
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How do I create a PDO parameterized query with a LIKE statement?
...>prepare('SELECT * FROM table WHERE column LIKE ?');
$query->execute(array('value%'));
while ($results = $query->fetch())
{
echo $results['column'];
}
share
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jQuery: Check if div with certain class name exists
...), and have a much larger memory impact as well (jQuery has to build up an array of all of the div elements on the page, then go back and loop through them to see whether they have that class, all to throw away the array at the end).
– T.J. Crowder
Apr 25 '11 a...
Java Reflection Performance
...rom S.O. as bad / misleading information. Cache the created objects in an array in both cases to prevent the optimizer from optimizing it out. (It can't do this in the reflective situation because it can't prove that the constructor doesn't have side-effects)
– Bill K
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Why does my application spend 24% of its life doing a null check?
...xt 63 are very fast since they'll be present in the cache.
Which makes an array by far the most efficient data structure. Also the reason that the .NET List<> class isn't a list at all, it uses an array for storage. The same for other collection types, like Dictionary, structurally not remote...