Programmer Think

1. Variables and simple data types 1.1 string A string is a series of characters. In Python, strings are enclosed in quotation marks, which can be single quotation marks or double quotation marks, as shown below: "This is a string." 'This is also a string.' This flexibility allows you to include quotation marks and apostrophes in strin ...

1. setState There are two ways to update the state using setState. Object expression is the abbreviation of function expression (syntax sugar). Use principle (not required): The new state does not depend on the original state = = > use objectThe new state depends on the original state = = = > use functional expressionIf you need to ge ...

1, Data type 1. Basic data type meaning: The data of the corresponding type is assigned to the variable of the corresponding type Automatic type lifting: Small ----- > Large It can be stored normally, but it may cause a waste of memory Cast type: Large ----- > small Can not occur, which may cause loss of accuracy Small range type variable ...

prefaceElectron is becoming increasingly popular because it is easy to use and has good support for various operating platforms.Today, I'd like to share my experience on how to use a set of code to quickly package and generate installation packages for mainstream platforms.Project installationFirst, use what I introduced earlier Tips for improv ...

1, Questions for each course Use an SQL statement to query the student table and the names of students with more than 80 points in each course. Solution 1: having Idea: if the minimum course score is greater than 80 points, then all his course scores must be greater than 80 points! code implementation SELECT name FROM xuesheng GROUP BY n ...

1, Effect display 2, Project introduction \qquad This project uses ArkUI (JS) to develop the interface, uses JS FA to call the interface function of JAVA PA, pulls the local album through JAVA, selects the picture and returns, copies the picture to the directory accessible by ...

day04 summary notes01 array introductionIntroduction: array is a kind of container, which can store multiple values of the same data typeint[] arr = {10,20,'a'}; System.out.println(arr[2]); // 97 double arr = {10,20,30}; System.out.println(arr[0]); // 10.0 ----------------------------------------------- proposal: The same d ...

prefaceElectron is becoming increasingly popular because it is easy to use and has good support for various operating platforms.Today, I'd like to share my experience on how to use a set of code to quickly package and generate installation packages for mainstream platforms.Project installationFirst, use what I introduced earlier Tips for improv ...

summary Reflection is NET, through reflection, you can obtain the member and member information of each type (including class, structure, delegate, interface and enumeration) in the program or assembly at run time. With reflection, you can know every type like the back of your hand. In addition, I can create objects directly, even if the type ...

Title Description Given a linked list of length n, each node contains an additional random pointer random, which can point to any node or empty node in the linked list.Construct a deep copy of this linked list. The deep copy should consist of exactly n new nodes, in which the value of each new node is set to the value of its corresponding orig ...