大约有 40,000 项符合查询结果（耗时：0.0701秒） [XML]
Passing a single item as IEnumerable
... well if the list/array is built ad-hoc, its scope ends after the method call, so it shouldn't cause problems
– Mario F
Oct 16 '09 at 12:55
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How to convert a DOM node list to an array in Javascript?
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Using spread (ES2015), it's as easy as: [...document.querySelectorAll('p')]
(optional: use Babel to transpile the above ES6 code to ES5 syntax)
Try it in your browser's console and see the magic:
for( links of [...document.links] )
console.log(links);
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Adding a directory to $LOAD_PATH (Ruby)
...so long as the memory usage is the same for each, which I assume it essentially is.
– boulder_ruby
Oct 12 '12 at 1:47
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What do the python file extensions, .pyc .pyd .pyo stand for?
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.py: This is normally the input source code that you've written.
.pyc: This is the compiled bytecode. If you import a module, python will build a *.pyc file that contains the bytecode to make importing it again later easier (and faster).
.pyo...
Create array of all integers between two numbers, inclusive, in Javascript/jQuery [duplicate]
... general information, in CoffeeScript it would look like "1..25" which actually transforms to something like this in JavaScript. So there is no easier way to do this.
– FreeCandies
Nov 9 '11 at 18:02
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How to check if variable is string with python 2 and 3 compatibility
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What about this, works in all cases?
isinstance(x, ("".__class__, u"".__class__))
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How to link a Facebook app with an existing fan page
...ou will find "App Page". There you will be able to create a new page or if all went well, select your page from a list.
I found the info in the little question-mark next to "App page".
I hope this helps.
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How to convert JSON string to array
...d keys). That's what the documentation says and that's what my PHP 5.2 installation returns. Are you using a function other than the official, built-in json_decode()? What does var_dump(json_decode($str, true)); return?
– RickN
Sep 22 '11 at 15:34
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Unable to install Maven on Windows: “JAVA_HOME is set to an invalid directory”
...ollowed the Maven tutorial to the letter but I still can't get Maven installed on Windows.
16 Answers
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Want to find records with no associated records in Rails
...).where( :friends => { :person_id => nil } )
For the hmt it's basically the same thing, you rely on the fact that a person with no friends will also have no contacts:
Person.includes(:contacts).where( :contacts => { :person_id => nil } )
Update
Got a question about has_one in the c...