Class method, static method, reflection, magic method, singleton mode

Catalog classmethod staticmethod instance issubclass reflex hasatter getatter setatter delatter Magic method Singleton mode What is singleton Why use singletons classmethod classmethod is a decorator that decorates ...

Posted on Sun, 13 Oct 2019 03:45:21 -0700 by edwinlcy

Understand thoroughly why arrays (strings) allocated on the stack cannot be used as return values

background Recent preparations From C Language Zero Foundation to PHP Extended Development Practice In the course of the case, the following code fragments are prepared to demonstrate the parsing of http scheme #include <stdio.h> #include <stdlib.h> #include <string.h> char *parse_scheme(const char *url) { char *p = strst ...

Posted on Sun, 13 Oct 2019 02:08:39 -0700 by BMurtagh

Mainstream Process Analysis of Spark sql Streaming Processing

Spark sql supports streaming processing, which includes Source and Sink. Source defines the source of the stream, Sink defines the destination of the stream, and the execution of the stream is triggered from Sink. The writeStream of Dataset defines the destination of the stream and triggers the real execution of the stream, so the analysis beg ...

Posted on Sun, 13 Oct 2019 00:55:35 -0700 by BlueKai

22. Closure and Inheritance

This article is reproduced in: Professional front-end website 22. Closure and Inheritance == Closures and object-oriented are the focus of interviews.== 1. closure 1. What is a closure function? A function nested in a function is called a closure function. Internal functions can always access the parameters and variables declared in thei ...

Posted on Sat, 12 Oct 2019 17:54:52 -0700 by squalls_dreams

Day 4 of java: String static Arrays class, Math class

Overview and characteristics of 1 string Once a string is created, it is immutable. A double quotation mark is a string. *** Three Construction Methods of 2 Strings 2-1 The first type: Format: String str = new String();.| :-| 2-2 The second type: Format: char [] chararray = {a','b'};| :-| String str2 = new String(chararray);| 2-3 Third Kind ...

Posted on Sat, 12 Oct 2019 15:10:07 -0700 by danf_1979

python-one-way list reverse order

How to Realize Inverse Order of Chain List Method 1: In-situ reverse sequence Algorithmic idea: When traversing the list, modify the pointer field of the current node to point to its predecessor node. Therefore, a pointer is needed to save its precursor. In addition, in order to find the successor ...

Posted on Sat, 12 Oct 2019 14:50:45 -0700 by chalbing

SpringBook Miscellaneous Notes - User Authentication Using JWT

Last article Introduced in JWT (JSON WEB TOKEN), this article describes how to use it in engineering. JWT. We can see on the official website that many warehouses have been packaged. JWT Here we chose the first java-jwt <!-- JSONWEBTOKEN --> <dependency> <groupId>com.auth0</gr ...

Posted on Sat, 12 Oct 2019 14:41:15 -0700 by texerasmo

JS Monitor Window Change and Element Change

resize incident brief introduction Can be used to monitor changes in Windows objects Application: Change rem according to window // Datum size const baseSize = 41.4; // Setting rem function function setRem(width) { // The current page width scaling ratio relative to 414 width can be modified according to their own needs. const scale = width ...

Posted on Sat, 12 Oct 2019 14:14:49 -0700 by byenary

Basic Experiment of Surveying and Mapping Programming 4 CSU

Basic Experiments of Surveying and Mapping Programming 4 (2) CSU Creation of Class 4 of Experiments (Leveling network design) I. purpose of the experiment II. Contents and Requirements of Experiments 3. Design and implementation: 3.1.1 Basic Framework 3.1.2 Membership 3.1.2 Elevation Approximation ...

Posted on Sat, 12 Oct 2019 14:02:43 -0700 by nadeemshafi9

C # Features and Index (C # Learning Notes 06)

Characteristic Attribute is a declarative tag used to transfer behavior information of various elements in a program (such as classes, methods, structures, enumerations, components, etc.) at runtime. Features can be viewed as a special class Enumeration Characteristic Grammar: [attribute(positional_parameters, name_parameter = value, ...)] ...

Posted on Sat, 12 Oct 2019 13:30:03 -0700 by gmdavis