大约有 24,976 项符合查询结果(耗时:0.0582秒) [XML]

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Possible to access the index in a Hash each loop?

I'm probably missing something obvious, but is there a way to access the index/count of the iteration inside a hash each loop? ...
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Why does scanf() need “%lf” for doubles, when printf() is okay with just “%f”?

Why is it that scanf() needs the l in " %lf " when reading a double , when printf() can use " %f " regardless of whether its argument is a double or a float ? ...
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Python argparse mutual exclusive group

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Regex how to match an optional character

I have a regex that I thought was working correctly until now. I need to match on an optional character. It may be there or it may not. ...
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Find the extension of a filename in Ruby

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How to sort the result from string_agg()

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Ternary Operator Similar To ?:

I am trying to avoid constructs like this: 5 Answers 5 ...
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What is the difference between t.belongs_to and t.references in rails?

What is the difference between t.references and t.belongs_to ? Why are we having those two different words? It seems to me they do the same thing? Tried some Google search, but find no explanation. ...
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Specify pane percentage in tmuxinator project

How can I specify a pane percentage in tmuxinator ? 1 Answer 1 ...
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Rails: where does the infamous “current_user” come from?

I've been looking around recently into Rails and notice that there are a lot of references to current_user . Does this only come from Devise? and do I have to manually define it myself even if I use Devise? Are there prerequisites to using current_user (like the existence of sessions, users, etc)...