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In Ruby, is there an Array method that combines 'select' and 'map'?
...ia as a postfix if. compact gets rid of the nils.
jruby-1.5.0 > [1,1,1,2,3,4].map{|n| n*3 if n==1}
=> [3, 3, 3, nil, nil, nil]
jruby-1.5.0 > [1,1,1,2,3,4].map{|n| n*3 if n==1}.compact
=> [3, 3, 3]
sha...
Gem::LoadError for mysql2 gem, but it's already in Gemfile
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247
If you have this error when upgrading to rails 4.2.4 (also with rails 4.1.5) try using this ve...
Serializing a list to JSON
... will need to install their respective packages.
If stuck using .Net Core 2.2 or earlier;
Default to using Newtonsoft JSON.Net as your first choice JSON Parser.
e.g.
using Newtonsoft.Json;
var json = JsonConvert.SerializeObject(aList);
you may need to install the package first.
PM> Instal...
How to get year/month/day from a date object?
alert(dateObj) gives Wed Dec 30 2009 00:00:00 GMT+0800
16 Answers
16
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Is there a “not equal” operator in Python?
...
dimo414
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answered Jun 16 '12 at 3:21
tskuzzytskuzzy
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Bash script to receive and repass quoted parameters
...
2 Answers
2
Active
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What is the use of a private static variable in Java?
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132
Of course it can be accessed as ClassName.var_name, but only from inside the class in which it i...
正则表达式 30 分钟入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...明作者以及来源。
正则表达式30分钟入门教程
版本：v2.31 (2009-4-11) 作者：deerchao 转载请注明来源
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