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When someone writes a new programming language, what do they write it IN?
...plemented in C. Then the first version of the language is used to create a new version, and so on. (Like Haskell.)
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Check if a value is an object in JavaScript
...e prototype property of a user-defined function: this is not Cs prototype
new C() -- "new"-ing a user-defined function
Math
Array.prototype
arrays
{"a": 1, "b": 2} -- objects created using literal notation
new Number(3) -- wrappers around primitives
... many other things ...
Object.create(nu...
namedtuple and default values for optional keyword arguments
...> Node()
Node(val=None, left=None, right=None)
Or better yet, use the new dataclasses library, which is much nicer than namedtuple.
>>> from dataclasses import dataclass
>>> from typing import Any
>>> @dataclass
... class Node:
... val: Any = None
... left: '...
Notifier 通知扩展：功能强大的Android通知管理工具，支持通知通道、意图、...
...fications
2.8 (2021-06-13)
LauncherIntent 中的 FlagNewTask 属性被忽略但Android 10需要FlagNewTask 属性的默认值更改为 true
2.9.1 (2022-10-13)
适配SDK31（Android 12）：所有 PendingIntent 获得 FLAG_IMMUTABLE 标志请求 android.per...
How do I make a checkbox required on an ASP.NET form?
...()
{
if (this.ControlToValidate.Length == 0)
throw new System.Web.HttpException(string.Format("The ControlToValidate property of '{0}' is required.", this.ID));
if (this.CheckBoxToValidate == null)
throw new System.Web.HttpException(string.Format("This co...
How to get object size in memory? [duplicate]
...may not be accurate but its close enough for me
long size = 0;
object o = new object();
using (Stream s = new MemoryStream()) {
BinaryFormatter formatter = new BinaryFormatter();
formatter.Serialize(s, o);
size = s.Length;
}
...
How do I exchange keys with values in a dictionary?
...
new_dict = dict(zip(my_dict.values(), my_dict.keys()))
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private final static attribute vs private final attribute
...rsion of the variable per instance of the class. So for example:
Test x = new Test();
Test y = new Test();
x.instanceVariable = 10;
y.instanceVariable = 20;
System.out.println(x.instanceVariable);
prints out 10: y.instanceVariable and x.instanceVariable are separate, because x and y refer to diff...
Why do we not have a virtual constructor in C++?
...es Coplien talks about how to implement virtual constructors in C++ (e.g., new animal("dog")). See users.rcn.com/jcoplien/Patterns/C++Idioms/… for some more information on how it's implemented
– Tony Lee
Sep 18 '09 at 18:16
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How can I check if a key exists in a dictionary? [duplicate]
...
deprecated applies to all new code. once it's deprecated, don't use it anymore.
– aaronasterling
Oct 2 '10 at 12:40
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