如何在vim中的行范围中添加行号？不像":set nu" - 这只显示数字,但不会将它们添加到文件中.
大多数ruby开发人员都知道如何通过执行以下操作来节省一些按键:
array.map(&:methodname)
而不是
array.map {|x| x.methodname }
有没有什么方法可以应用类似的&:methodname快捷方式来调用哈希数组中的"方法"(通过键调用的值)？
在我的情况下,它的JSON api结果以60个批量返回,作为源自JSON的哈希数组.我试图这样做,但没有成功:
array.map(&:"keyname")
但是没有成功,抛出一个NoMethodError并且说Hash没有'keyname'方法,这是合理的我猜.我想知道是否有一些神奇的子弹来模仿这个&:...红宝石家伙已经解决过的哈希的快捷方式.
这是实际的JSON响应之一,我认为仅限于5个结果
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这应该是一个非常简单的正则表达式问题,但我无法在任何地方找到任何答案.如何制作一个正则表达式,它只匹配2个字符或至少4个字符.这是我目前的做法(忽略正则表达式本身,除此之外):
[A-Za-z0_9_]{2}|[A-Za-z0_9_]{4,}
但是,这种方法花费了两倍的时间(对于400行文件,我的速度大约慢了0.3秒),所以我想知道是否有更好的方法来做到这一点？
我正在尝试将我创建的全局变量中包含的数组传递到我的mac上的剪贴板中.
它很长,所以我不想在我的控制台上突出显示,复制和粘贴.
我想使用嵌入式unix代码,特别是pbcopymac笔记本电脑控制台的功能,它允许我将文本传递到我的计算机剪贴板,准备粘贴.
如果我用文件保存这样做,我会做这样的事情(在ruby中):
stringdata = <<blah blah blah process, lets say it failed and the progress data is stored in this variable so we can skip forward to where the script screwed up in a process when we start up and handle the error instance(s)>>
File.open("temp.txt"){|f| f.write(stringdata)}
`cat temp.txt | pbcopy`
但是我可以在不创建临时文件的情况下这样做吗？
我确信这是可能的.文本中的所有内容都是可能的.提前感谢您的解决方案
我看到了这两个错误的并置,并且鉴于谷歌搜索结果的缺乏,我不得不问.有什么区别,我需要做什么？
deploy=# GRANT SELECT ON angel_research_production TO angel_research;
ERROR: relation "angel_research_production" does not exist
deploy=# create database angel_research_production;
ERROR: database "angel_research_production" already exists
我的猜测是我需要从其他一些用户做这个授权选择业务...
所以我在postgres(dbroot)上运行它并得到这个:
postgres=# GRANT SELECT ON angel_research_production TO angel_research;
ERROR: relation "angel_research_production" does not exist
因此它确实作为数据库存在,但不作为关系存在.我怎么能纠正这个问题,这里有什么根本问题？我有点不知所措.谢谢
当我尝试使用psql登录我的数据库时,执行以下操作:
psql dbname --username=qgis --password
>>(prompts for password, entered password)
psql: FATAL: permission denied for database "gisdatabase"
DETAIL: User does not have CONNECT privilege.
我在Google上搜索了有关这个简单问题的信息,但没有找到任何人直接谈论此事.
我试过这样做:
psql dbname
>>ALTER ROLE qgis WITH CONNECT;
但得到了这个错误:
ERROR: unrecognized role option "connect"
再一次,我在这里,再问一个关于stackoverflow的问题.谢谢你们的时间
我是一个介绍性的软件开发课程,我的作业是创建一个岩石剪刀程序,它带有两个参数(摇滚,纸张)等,并返回获胜的arg.
现在如果我可以使用条件语,我会快速解决这个问题,但是作业说我们需要知道的一切都在红宝石教科书的前三章中,而这些章节不包括条件语!没有它们可以创建这个程序吗？或者他只是期望我们足智多谋并使用条件？虽然这是一个非常简单的条件分配...我想我可能会在这里遗漏一些东西.
编辑:我正在考虑那个chmod数值系统,并认为通过该添加系统可以实现解决方案......
我发现自己想要像Python这样的东西
ary = [1,2,3,4,5,6,7,8]
ary[2:] #=> [3,4,5,6,7,8]
这些天所有的时间.
解决方案总是变得多线和丑陋.我想知道那里最优雅的解决方案是什么,因为我不值得展示.
2016年2月5日是东部标准时区(美国)的下午8:04.
当我运行此命令
Time.now.today?
#=> false
它返回false.
为什么,我该如何纠正呢？谢谢.
细节: