大约有 47,000 项符合查询结果（耗时：0.0574秒） [XML]
Why is arr = [] faster than arr = new Array?
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answered Sep 10 '11 at 23:51
Roger PoonRoger Poon
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Why use Dijkstra's Algorithm if Breadth First Search (BFS) can do the same thing faster?
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edited Nov 10 '11 at 9:11
answered Sep 29 '10 at 0:58
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Does Flask support regular expressions in its URL routing?
... super(RegexConverter, self).__init__(url_map)
self.regex = items[0]
app.url_map.converters['regex'] = RegexConverter
@app.route('/<regex("[abcABC0-9]{4,6}"):uid>-<slug>/')
def example(uid, slug):
return "uid: %s, slug: %s" % (uid, slug)
if __name__ == '__main__':
a...
Find directory name with wildcard or similar to “like”
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find supports wildcard matches, just add a *:
find / -type d -name "ora10*"
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Using System.Dynamic in Roslyn
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answered Apr 4 '14 at 14:04
AlbertoAlberto
13.2k88 gold badges4040 silver badges4949 bronze badges
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What is the PostgreSQL equivalent for ISNULL()
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460
SELECT CASE WHEN field IS NULL THEN 'Empty' ELSE field END AS field_alias
Or more idiomatic:
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How to set an environment variable only for the duration of the script?
On Linux (Ubuntu 11.04) in bash, is it possible to temporarily set an environment variable that will only be different from the normal variable for the duration of the script? For example, in a shell script, making an app that saves to HOME portable by temporarily setting HOME to a folder in the pre...
css overflow - only 1 line of text
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edited May 23 '17 at 12:02
Community♦
111 silver badge
answered Sep 25 '11 at 15:32
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split string in to 2 based on last occurrence of a separator
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120
Use rpartition(s). It does exactly that.
You can also use rsplit(s, 1).
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Why is using the rails default_scope often recommend against?
... when wanting to show unpublished (private) posts. So far so good.
2.1.1 :001 > Post.all
Post Load (0.2ms) SELECT "posts".* FROM "posts" WHERE "posts"."published" = 't'
Well this is pretty much what we expect. Now lets try:
2.1.1 :004 > Post.new
=> #<Post id: nil, title: nil, p...