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Simplest/Cleanest way to implement singleton in JavaScript?
...
return { // public interface
publicMethod1: function () {
// all private members are accessible here
},
publicMethod2: function () {
}
};
})();
This has been called the module pattern, it basically allows you to encapsulate private members on an object, by taking advant...
super() fails with error: TypeError “argument 1 must be type, not classobj” when parent does not inh
...ss. Change it like so:
class B(object):
and it will work.
super() and all subclass/superclass stuff only works with new-style classes. I recommend you get in the habit of always typing that (object) on any class definition to make sure it is a new-style class.
Old-style classes (also known as...
What's the difference between lists and tuples?
.... A list on the other hand could be used to store multiple locations. Naturally one might want to add or remove locations from the list, so it makes sense that lists are mutable. On the other hand it doesn't make sense to add or remove items from an existing location - hence tuples are immutable.
T...
PHP passing $_GET in linux command prompt
Say we usually access via
13 Answers
13
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Difference between Python's Generators and Iterators
...ry generator is an iterator, but not vice versa. A generator is built by calling a function that has one or more yield expressions (yield statements, in Python 2.5 and earlier), and is an object that meets the previous paragraph's definition of an iterator.
You may want to use a custom iterator, ra...
A semantics for Bash scripts?
...patchwork together little scripts that appear to work. However, I don't really know what's going on, and I was hoping for a more formal introduction to Bash as a programming language. For example: What is the evaluation order? what are the scoping rules? What is the typing discipline, e.g. is ever...
高并发服务端分布式系统设计概要 - C/C++ - 清泛网 - 专注C/C++及内核技术
...说，我这套系统用于微博（就假想我们做一个山寨的推特吧，给他个命名就叫“山推” 好了，以下都叫山推，Stwi），那么，“我关注的人”这一个业务的数据，肯定和“我发了的推文”这个业务的数据是分开存储的，那么我们...
Python nested functions variable scoping [duplicate]
I've read almost all the other questions about the topic, but my code still doesn't work.
10 Answers
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动态追踪（Dynamic Tracing）技术漫谈 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...，有些问题甚至是我意外发现的。下面就随便举几个例子吧。
第一个例子是，我使用基于 SystemTap 的火焰图工具分析我们线上的 Nginx 进程，结果发现有相当一部分 CPU 时间花费在了一条非常奇怪的代码路径上面。这其实是我一...
Is this object-lifetime-extending-closure a C# compiler bug?
...L_000e: ldloc.0
IL_000f: ldc.r8 42
IL_0018: ldc.r8 1
IL_0021: call float64 [mscorlib]System.Math::Pow(float64, float64)
IL_0026: stfld float64 ConsoleApplication1.Program/Foo/'<>c__DisplayClass1'::capturedVariable
IL_002b: ldarg.0
IL_002c: ldloc.0
IL_002d: ldftn ins...