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How do RVM and rbenv actually work?
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App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 · App Inventor 2 中文网
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其中：
values - 表示待发送的数据（这里是单字节0x01，表示高电平）
signed - 表示values数据是否是有符号的数值（假表示无符号）
serviceUuid - 服务UUID，通俗来讲它就是硬件的唯一身份ID
characteristicUuid - 特性UUID，通俗来...
dplyr summarise: Equivalent of “.drop=FALSE” to keep groups with zero length in output
...the same result using xtabs, for example:
using dplyr:
df %>%
xtabs(formula = ~ b) %>%
as.data.frame()
or shorter:
as.data.frame(xtabs( ~ b, df))
result (equal in both cases):
b Freq
1 1 6
2 2 6
3 3 0
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How do you return from 'gf' in Vim
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jopjop
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Coffeescript — How to create a self-initiating anonymous function?
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As of CoffeeScript 1.3.1 (released April 2012), do also lets you pass arguments to the function. To pass 1 and 2 as the parameters x and y, write do (x = 1, y = 2) ->. (The documentation for this feature has gotten lost, but the issue where the feature was introdu...
Should I use single or double colon notation for pseudo-elements?
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Remove file extension from a file name string
...s file path
– lemon
Oct 2 '15 at 22:01
8
This is a better answer as it preserves the path
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Do you have to put Task.Run in a method to make it async?
I'm trying to understand async await in the simplest form. I want to create a very simple method that adds two numbers for the sake of this example, granted, it's no processing time at all, it's just a matter of formulating an example here.
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Why XML-Serializable class need a parameterless constructor
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This is a limitation of XmlSerializer. Note that BinaryFormatter and DataContractSerializer do not require this - they can create an uninitialized object out of the ether and initialize it during deserialization.
Since you are using xml, you might consider using DataContractSeri...
How to prevent browser page caching in Rails
...nse.headers["Pragma"] = "no-cache"
response.headers["Expires"] = "Mon, 01 Jan 1990 00:00:00 GMT"
end
end
Rails 4 and older versions:
class ApplicationController < ActionController::Base
before_filter :set_cache_headers
private
def set_cache_headers
response.headers["Cache-Co...