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What is the difference between class and instance attributes?
... answered Oct 16 '08 at 1:26
Alex CoventryAlex Coventry
55.1k44 gold badges3232 silver badges3737 bronze badges
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Why does Ruby have both private and protected methods?
...s another instance's private methods directly.
Here is a quick practical example:
def compare_to(x)
self.some_method <=> x.some_method
end
some_method cannot be private here. It must be protected because you need it to support explicit receivers. Your typical internal helper methods can...
How do I style a dropdown with only CSS?
...re are three solutions:
Solution #1 - appearance: none - with Internet Explorer 10 - 11 workaround (Demo)
--
To hide the default arrow set appearance: none on the select element, then add your own custom arrow with background-image
select {
-webkit-appearance: none;
-moz-appearance: none;
...
Get Character value from KeyCode in JavaScript… then trim
...n using numbers on the number pad, e.keyCode is not the ASCII (or even UTF-x) code.
– Tom Chiverton
Jan 6 '14 at 9:38
2
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How can I unit test Arduino code?
...ino device
Observe behavior and guess whether your code is doing what you expect
Repeat
Step 3 is particularly nasty if you expect to get diagnostic messages via serial port but your project itself needs to use your Arduino's only hardware serial port. If you were thinking that the SoftwareSerial...
ZMQ: 基本原理 - 开源 & Github - 清泛网 - 专注C++内核技术
... 手机“扫一扫” var qrcode = new QRCode("qrcode", { text: 'https://m.tsingfun.com/it/opensource/0MQ-The-Theoretical-Foundation.html', //URL地址 width: 180, height: 180, colorDark: '#088CEF', //二维码颜色 colorLight: "#ffffff" //背景颜色 }); $(fu...
live output from subprocess command
...ine, it gives me output about what iteration its at, what time, what the next time-step is, etc.
16 Answers
...
My attempt at value initialization is interpreted as a function declaration, and why doesn't A a(())
...e many things Stack Overflow has taught me is what is known as the "most vexing parse", which is classically demonstrated with a line such as
...
Difference between sh and bash
...the Shell Command Language) is a programming language described by the POSIX
standard.
It has many implementations (ksh88, dash, ...). bash can also be
considered an implementation of sh (see below).
Because sh is a specification, not an implementation, /bin/sh is a symlink
(or a hard link) to an a...
Just what is Java EE really? [closed]
...cally that's nearly always Tomcat). Some parts of Java EE, like JPA, have explicit sections in their respective specifications that tells how they should work and be used in Java SE.
If anything, it's not so much an application server environment per se that's at stake here, but the presence of all...