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Replace one substring for another string in shell script
...urrences, use ${parameter//pattern/string}:
message='The secret code is 12345'
echo "${message//[0-9]/X}"
# prints 'The secret code is XXXXX'
(This is documented in the Bash Reference Manual, §3.5.3 "Shell Parameter Expansion".)
Note that this feature is not specified by POSIX — it...
What is the leading LINQ for JavaScript library? [closed]
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13
Have you seen Rx for Javascript, yet? That's what you want.
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How can I see the SQL that will be generated by a given ActiveRecord query in Ruby on Rails
...eir queries directly. It is private API so there is a huge risk that Rails 3 will totally break it, but for debugging, it is an ok solution.
The method is construct_finder_sql(options) (lib/active_record/base.rb:1681) you will have to use send because it is private.
Edit: construct_finder_sql was...
Why did Rails4 drop support for “assets” group in the Gemfile
In Rails 3, gems used exclusively to generate assets in the asset pipeline were properly placed in the assets group of the Gemfile:
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Flatten an irregular list of lists
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390
Using generator functions can make your example a little easier to read and probably boost the...
Can I have multiple :before pseudo-elements for the same element?
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3 Answers
3
Active
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Rails: Is there a rails trick to adding commas to large numbers?
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354
You want the number_with_delimiter method. For example:
<%= number_with_delimiter(@number,...
Delete multiple records using REST
... intermediaries as meaning “DELETE the (single) resource at /records/1;2;3” — So a 2xx response to this may cause them to purge their cache of /records/1;2;3; not purge /records/1, /records/2 or /records/3; proxy a 410 response for /records/1;2;3, or other things that don't make sense from yo...
Pandas count(distinct) equivalent
...ple:
In [2]: table
Out[2]:
CLIENTCODE YEARMONTH
0 1 201301
1 1 201301
2 2 201301
3 1 201302
4 2 201302
5 2 201302
6 3 201302
In [3]: table.groupby('YEARMONTH').CLIENTCODE.nunique()
Out[3]:
YEARM...
Which UUID version to use?
...eed to always generate the same UUID from a given name, you want a version 3 or version 5.
Version 3: This generates a unique ID from an MD5 hash of a namespace and name. If you need backwards compatibility (with another system that generates UUIDs from names), use this.
Version 5: This generates ...