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What's an elegant way to conditionally add a class to an HTML element in a view?
...ass_names({ foo: true, bar: false })
# => "foo"
class_names(nil, false, 123, "", "foo", { bar: true })
# => "123 foo bar"
Sources:
Link to the corresponding PR.
Link to the class_names docs.
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Floating View 扩展：悬浮视图扩展，将组件转换为悬浮窗口 · App Inventor 2 中文网
...件的可见部分转移到悬浮视图中，即使用户在其他应用中操作时也能保持活跃状态。使用此功能的应用示例包括即时通讯应用等。
包名：com.jdl.FloatingView
版本：1.2
发布日期：2020年6月14日
最后更新：2020年6月28日
作者：Jarliss...
Eclipse RCP开发桌面程序 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...些基本概念有点了解，在OpenGL中，3D场景不是直接绘制到操作系统的窗口上的，而是有一个称为着色描述表（Rendering Context）的东西，我们这里简称它为context，OpenGL的绘图命令都是在当前context上进行绘制，然后再把它渲染到操作...
Camera 扩展：相机拍照和录像，程序控制拍照、自动拍照实现，而无需点击系...
...拍照和录像，程序控制拍照、自动拍照实现，而无需点击系统相机拍照按钮
Camera 扩展
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功能概述
截图
1:1 宽高比
3:4 宽高比
9:16 宽高比
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创业 比“直男癌”更可怕的是“技术癌” - 资讯 - 清泛网 - 专注C/C++及内核技术
...当时方兴未艾的RFID技术做了一整套的生猪养殖过程监控系统。他们的解决方案是这样的：给每一头猪都打上一个RFID耳标，而后通过后台管理系统自动追踪每一头猪的喂养和用药情况。当时的一个RFID猪耳标售价二三十元，再加上...
Static/Dynamic vs Strong/Weak
...kly typed that "12" + "34" would equal "46", but "12" + "34Q" would equal "1234Q" [fortunately, one could write "12" & "34" if one wanted concatenation]. Curiously, variables holding numbers stored them as double-precision floats, and math on such variables used the floating-point values without...
Split comma-separated strings in a column into separate rows
...me number of strings. i.e. data.table(id= "X21", a = "chr1;chr1;chr1", b="123;133;134",c="234;254;268") becoming data.table(id = c("X21","X21",X21"), a=c("chr1","chr1","chr1"), b=c("123","133","134"), c=c("234","254","268")) ?
– Reilstein
Jan 19 '19 at 1:39
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Python argparse mutual exclusive group
... answered Dec 28 '14 at 10:38
Oz123Oz123
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Best way to represent a fraction in Java?
...on("Unknown format '" + s + "'");
}
// this translates 23.123e5 to 25,123 / 1000 * 10^5 = 2,512,300 / 1 (GCD)
String whole = m.group(1);
String decimal = m.group(2);
String exponent = m.group(3);
String n = whole;
// 23.123 => 23123
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What is the meaning and difference between subject, user and principal?
...clarify "User - subset of principal"? If John is the subject and "account #123" is his principal, the user is who? Are there two John's? Since Genus > Species > Individual is increasingly specific, John (user) should be more specific than John (subject). Or am I missing something?
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