大约有 45,000 项符合查询结果（耗时：0.0749秒） [XML]
Delete everything in a MongoDB database
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Use with caution: if you're in a sharded environment using wiredTiger and you have no user database and you invoke dropDatabase, the database will be deleted and could re-appear as primary on a different shard when new records are added.
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Why use Object.prototype.hasOwnProperty.call(myObj, prop) instead of myObj.hasOwnProperty(prop)?
If I understand correctly, each and every object in Javascript inherits from the Object prototype, which means that each and every object in Javascript has access to the hasOwnProperty function through its prototype chain.
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When and why would you seal a class?
...e it really made full sense, because it becomes expensive performance-wise if left untreated. The sealed keyword tells the CLR that there is no class further down to look for methods, and that speeds things up.
In most performance-enhancing tools on the market nowadays, you will find a checkbox th...
How to pip install a package with min and max version range?
I'm wondering if there's any way to tell pip, specifically in a requirements file, to install a package with both a minimum version ( pip install package>=0.2 ) and a maximum version which should never be installed (theoretical api: pip install package<0.3 ).
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How to execute shell command in Javascript
...og('stdout: ' + stdout);
console.log('stderr: ' + stderr);
if (error !== null) {
console.log('exec error: ' + error);
}
});
child();
Hope this helps!
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How do you list the active minor modes in emacs?
... (mapc (lambda (mode) (condition-case nil
(if (and (symbolp mode) (symbol-value mode))
(add-to-list 'active-modes mode))
(error nil) ))
minor-mode-list)
(message "Active modes are %s" active-mod...
What is the best way to get the count/length/size of an iterator?
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If you've just got the iterator then that's what you'll have to do - it doesn't know how many items it's got left to iterate over, so you can't query it for that result. There are utility methods that will seem to do this (su...
Do you leave parentheses in or out in Ruby? [closed]
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multiple arguments and no parentheses.
A lot of Ruby-based Domain Specific Languages (such as Rake) don't use
parenthesis to preserve a more natural
language feel to their statements.
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Remove everything after a certain character
...g the value from an href and up to the "?", and it's always going to be a different amount of characters.
8 Answers
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Diff Algorithm? [closed]
I've been looking like crazy for an explanation of a diff algorithm that works and is efficient.
5 Answers
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