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Is it good practice to use the xor operator for boolean checks? [closed]
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What is the best way to uninstall gems from a rails3 project?
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136
Bundler is launched from your app's root directory so it makes sure all needed gems are present...
How can I create an object and add attributes to it?
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answered May 13 '10 at 14:49
Alex MartelliAlex Martelli
724k148148 gold badges11251125 silver badges13241324 bronze badges
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rails 3.1.0 ActionView::Template::Error (application.css isn't precompiled)
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313
By default Rails assumes that you have your files precompiled in the production environment, i...
Create an empty data.frame
...AlldigEmAll
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3
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Aborting a shell script if any command returns a non-zero value?
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Andy
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answered May 4 '09 at 19:00
Ville LaurikariVille Laurikari
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评分条使用指导 · App Inventor 2 中文网
...n Screen1.Initialize() {
评分条1.StepSize = 0.5
评分条1.Rating = 3.5
评分条1.ReadOnly = true
}
when 按钮_编辑.Click() {
评分条1.ReadOnly = false
}
when 按钮_锁定.Click() {
评分条1.ReadOnly = true
}
when 评分条1.RatingChanged(评分) {
标签1.Text = join("评分...
How to do what head, tail, more, less, sed do in Powershell? [closed]
...elect -last 10 # tail
gc -Tail 10 log.txt # also tail (since PSv3), also much faster than above option
gc log.txt | more # or less if you have it installed
gc log.txt | %{ $_ -replace '\d+', '($0)' } # sed
This works well enough for small files, larger ones (more tha...
日历日程使用指导 · App Inventor 2 中文网
... 10, 8, 9, 0, 0), 计时器1.MakeInstantFromParts(2026, 10, 8, 10, 0, 0), "305 室", "带电脑", 15)
}
when 日历日程1.EventAdded(日程编号) {
微数据库1.StoreValue("meeting_id", 日程编号)
对话框1.ShowAlert("已加入日历，开会前 15 分钟提醒")
}
when 按钮_取消.Cl...
How to install python modules without root access?
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307
In most situations the best solution is to rely on the so-called "user site" location (see the...