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Course Introduction：Implementing methods in JavaScript that mainly rely on arrays is implemented. 1. The stack uses push to stack and pop to stack to achieve last-in first out; 2. The queue uses push to queue and shift to queue to realize first-in first out; 3. The queue can also be implemented in reverse; 4. It is recommended to encapsulate it into classes for reuse and management, such as the Stack class includes push, pop, peek and isEmpty methods; 5. The array implementation is simple and direct, but performance issues need to be paid attention to, especially shift operations may affect efficiency.

2025-07-13 comment 0  646

Course Introduction：ContextManager is a tool used in Python to automatically manage resources, ensuring the correct release of resources through with statements; its core is a class that implements enter and exit methods or a generator function that uses contextmanager decorator; common application scenarios include file operations, database connections, locking mechanisms and temporary directory management; when customizing, you need to pay attention to exception handling, cleaning logic and resource nesting management.

2025-07-22 comment 0  934

Course Introduction：JavaScript's event loop implements non-blocking asynchronous execution through the management call stack and task queue. 1. When the code is executed, the functions are put into the stack in turn; 2. Asynchronous operations (such as setTimeout and fetch) are handed over to the browser API for processing, and after completion, their callbacks enter the task queue; 3. Continuous checking of the event loop: When the call stack is empty, priority is given to clear the micro-task queue (such as Promise callback), and then execute a macro task (such as setTimeout); 4. Therefore, even if setTimeout is 0 milliseconds, it will be executed after synchronizing the code and the micro-task to ensure that the current task is not interrupted; 5. This mechanism makes JavaScript efficiently respond to asynchronous operations even though it is single-threaded.

2025-08-04 comment 0  706

Course Introduction：In PHP, implementing polymorphism can be achieved through method rewriting, interfaces, and type prompts. 1) Method rewriting: Subclasses override parent class methods and perform different behaviors according to object type. 2) Interface: The class implements multiple interfaces to realize polymorphism. 3) Type prompt: Ensure that the function parameters are specific to the type and achieve polymorphism.

2025-05-20 comment 0  1104

Course Introduction：A decorator is a tool that modifies or enhances the behavior of a function or class without changing its source code. It implements function extension by accepting the objective function or class as parameters and returning a new wrapped function or class. It is often used to add logs, permission control, timing and other functions. To create a decorator: 1. Define a function that receives a function or class; 2. Define a wrapper function in it to add additional operations; 3. Call the original function or class; 4. Return the wrapped result. Just use the @decorator_name syntax to apply it to the objective function or class. For functions with parameters, compatibility can be ensured using *args and **kwargs in the decorator. Python has built-in @staticmethod and @c

2025-06-30 comment 0  933

Course Elementary  13825

Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.

Course Elementary  82361

Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).

Course Elementary  13181

Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.

Course Elementary  24630

Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.

Course Elementary  27488

Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.