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What's the difference between [ and [[ in Bash? [duplicate]
I looked at bash man page and the [[ says it uses Conditional Expressions. Then I looked at Conditional Expressions section and it lists the same operators as test (and [ ).
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How ViewBag in ASP.NET MVC works
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ViewBag is of type dynamic but, is internally an System.Dynamic.ExpandoObject()
It is declared like this:
dynamic ViewBag = new System.Dynamic.ExpandoObject();
which is why you can do :
ViewBag.Foo = "Bar";
A Sample Expander Object Code:
public class ExpanderObject : DynamicObject, ...
How to get HTTP Response Code using Selenium WebDriver
...get the response code of a http request using Selenium and Chrome or Firefox. All you have to do is start either Chrome or Firefox in logging mode. I will show you some examples below.
java + Selenium + Chrome
Here is an example of java + Selenium + Chrome, but I guess that it can be done in any l...
How do you redirect HTTPS to HTTP?
... true for your domain name and your hosting! A PKI certificate is now NOT expensive compared to domain names, and is insignificant compared to hosting/bandwidth costs!
– verdy_p
Feb 17 '19 at 12:27
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Integer to hex string in C++
How do I convert an integer to a hex string in C++ ?
17 Answers
17
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App Inventor 2 列表积木完全指南：从入门到精通，一篇搞定数据存储 - App...
...全新的列表。使用变量名 item 引用当前元素：
Map: [ item x 2 ] -> [1,2,3] 变为 [2,4,6]复制代码
2. 创建过滤列表（Filter）
根据布尔表达式筛选满足条件的元素：
Filter: [ item > 2 ] -> [1,2,3,4] ...
How to extract the year from a Python datetime object?
I would like to extract the year from the current date using Python.
4 Answers
4
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Select first 4 rows of a data.frame in R
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Use head:
dnow <- data.frame(x=rnorm(100), y=runif(100))
head(dnow,4) ## default is 6
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How to perform case-insensitive sorting in JavaScript?
...yet supported on all platforms/browsers. I know they are not used in this example, but just wanted to add for clarity. See MDN for more info
– Ayame__
Jan 9 '14 at 15:05
105
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Why can't I reference System.ComponentModel.DataAnnotations?
I'm trying to use DataAnnotations in my WPF project to specify a maximum length of strings, with the following:
14 Answers
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