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There is such an interview question:let a = { n: 1}; a.x = a = { n: 2}; console.log(a.x); Ask what the output is.The output of this question is undefined, because the assignment is carried out from left to right, that is, assign {n: 2} to a.x and then to a.Add a variable preA to reference a before assignment, and you can see:This is the probl ...

Principle analysis of Spring circular dependency 1. What is circular dependency# When we use Spring, we inject another object into one object, but another object also contains the object. As shown in the figure: Student contains an attribute of teacher; The Teacher contains the attribute of student. This creates a circular dependency. 2. ...

1, Introduction to multitasking Multitasking: multiple tasks are executed at the same time, which is multitaskingpython programs are single task by default 2, [key] thread - basic use Thread is the basic unit of CPU scheduling Main thread: after the program starts, there is a default main thread, which is usually called the main thre ...

Tencent cloud database MongoDB naturally supports functions such as high availability, distribution, high performance, high compression, schema free and perfect client access balancing strategy. Based on the advantages of MongoDB, a key user in the cloud selects MongoDB as the primary storage service. The user's business scenario is as follows: ...

This article was originally released by RT thread user @ chengjili and is used to participate in the n32g457 RT thread design competition jointly launched by RT thread and national technology. The original text: https://club.rt-thread.org/as...This design is used to participate in the innovation "core" engine - national technology n32 ...

Article catalogue NodeJS environment configuration MAC configuration Installation mode 2:node version management: Linux configurationWindows configuration Development environment initialization Basic environmentBaidu OCR dockingMy example code Docker deploymentLittle knowledgePuppeter syntaxError summaryMy blog NodeJS en ...

WaitGroup is a concurrency control technology often used in the development process. It is used to control waiting for the end of a group of goroutine s in the program.Implementation principledata structureThe data structure of WaitGroup includes a noCopy auxiliary field and an array of state1 records the state of WaitGroup:Auxiliary fields of ...

I won't say much about the importance of algorithms. If you want to go to a large factory, you must go through the interview of basic knowledge and business logic + algorithm. So, in order to improve the algorithm ability, this official account will be followed up every day to do an algorithm question, and the topic will be selected from LeetCo ...

prefaceThe main way to define objects in pydantic is through models (models inherit BaseModel). pydantic is mainly a parsing library, not a validation library. Verification is a means to achieve the goal: establish a model that conforms to the types and constraints provided. In other words, pydantic guarantees the types and constraints of the o ...

Background analysis In microservices, the first problem we need to face is how to find services (software is a service), and the second is how to communicate between different services? How to manage every service in the application better and more conveniently, and how to establish the link between various services, so that the registration c ...