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How does grep run so fast?
...omparison
# (everything is in the buffer cache)
$ time grep -c 'tg=f_c' 20140910.log
28
0.168u 0.068s 0:00.26
$ time grep -c ' /cc/merchant.json tg=f_c' 20140910.log
28
0.100u 0.056s 0:00.17
The longer form is 35% faster!
How come? Boyer-Moore consructs a skip-forward table from the pattern-st...
Converting string from snake_case to CamelCase in Ruby
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10 Answers
10
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Get city name using geolocation
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204
You would do something like that using Google API.
Please note you must include the google ma...
Check a collection size with JSTL
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<c:if test="${companies.size() > 0}">
</c:if>
This syntax works only in EL 2.2 or newer (Servlet 3.0 / JSP 2.2 or newer). If you're facing a XML parsing error because you're using JSPX or Facelets instead of JSP, then use gt instead of >.
<c...
How to get a substring of text?
I have text with length ~700. How do I get only ~30 of its first characters?
5 Answers
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python numpy ValueError: operands could not be broadcast together with shapes
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user2357112 supports Monica
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answered Jul 3 '14 at 22:08
DrVDrV
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How can you debug a CORS request with cURL?
...successful, these headers shouldn't appear, or the HTTP response won't be 200.
You can also specify additional headers, such as User-Agent, by using the -H flag.
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How to make a promise from setTimeout
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Update (2017)
Here in 2017, Promises are built into JavaScript, they were added by the ES2015 spec (polyfills are available for outdated environments like IE8-IE11). The syntax they went with uses a callback you pass into the Promise...
Is there an alternative to string.Replace that is case-insensitive?
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From MSDN
$0 - "Substitutes the last substring matched by group number number (decimal)."
In .NET Regular expressions group 0 is always the entire match. For a literal $ you need to
string value = Regex.Replace("%PolicyAmount%", "%Pol...
Converting between datetime, Timestamp and datetime64
... np
>>> dt = datetime.utcnow()
>>> dt
datetime.datetime(2012, 12, 4, 19, 51, 25, 362455)
>>> dt64 = np.datetime64(dt)
>>> ts = (dt64 - np.datetime64('1970-01-01T00:00:00Z')) / np.timedelta64(1, 's')
>>> ts
1354650685.3624549
>>> datetime.utcfromt...