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How to map and remove nil values in Ruby
...t to become the norm very soon.
For example:
numbers = [1, 2, 5, 8, 10, 13]
enum.filter_map { |i| i * 2 if i.even? }
# => [4, 16, 20]
In your case, as the block evaluates to falsey, simply:
items.filter_map { |x| process_x url }
"Ruby 2.7 adds Enumerable#filter_map" is a good read on the s...
How to thoroughly purge and reinstall postgresql on ubuntu? [closed]
...er Port Status Owner Data directory Log file
11 main 5432 online postgres /var/lib/postgresql/11/main /var/log/postgresql/postgresql-11-main.log
$ sudo systemctl stop postgresql@11-main
$ sudo pg_dropcluster --stop 11 main
$ sudo pg_createcluster --start 11 main
Option B
If yo...
Java URL encoding of query string parameters
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1183
URLEncoder is the way to go. You only need to keep in mind to encode only the individual query s...
LR性能测试结果样例分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...试的目的，正如 所列的指标，本次测试的要求是验证在30分钟内完成2000次用户登录系统，然后进行考勤业务，最后退出，在业务操作过程中页面的响应时间不超过3秒，并且服务器的CPU使用率、内存使用率分别不超过75%、70%，那...
How to get the last element of an array in Ruby?
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edited Dec 26 '11 at 23:15
answered Dec 26 '11 at 23:07
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How do you specify the Java compiler version in a pom.xml file?
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312
<project>
[...]
<build>
[...]
<plugins>
<plugin>
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Are default enum values in C the same for all compilers?
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James McNellisJames McNellis
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What are “named tuples” in Python?
Reading the changes in Python 3.1 , I found something... unexpected:
11 Answers
11
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