Summary of basic JavaScript knowledge (10) Closures and immediate execution functions

Face detection and recognition technology is already a relatively mature and widely used technology. Currently, the most widely used Internet application language is JS. Implementing face detection and recognition on the Web front-end has advantages and disadvantages compared to back-end face recognition. Advantages include reducing network interaction and real-time recognition, which greatly shortens user waiting time and improves user experience; disadvantages include: being limited by model size, the accuracy is also limited. How to use js to implement face detection on the web? In order to implement face recognition on the Web, you need to be familiar with related programming languages ​​and technologies, such as JavaScript, HTML, CSS, WebRTC, etc. At the same time, you also need to master relevant computer vision and artificial intelligence technologies. It is worth noting that due to the design of the Web side

In C++, a closure is a lambda expression that can access external variables. To create a closure, capture the outer variable in the lambda expression. Closures provide advantages such as reusability, information hiding, and delayed evaluation. They are useful in real-world situations such as event handlers, where the closure can still access the outer variables even if they are destroyed.

C++ Lambda expressions support closures, which save function scope variables and make them accessible to functions. The syntax is [capture-list](parameters)->return-type{function-body}. capture-list defines the variables to capture. You can use [=] to capture all local variables by value, [&] to capture all local variables by reference, or [variable1, variable2,...] to capture specific variables. Lambda expressions can only access captured variables but cannot modify the original value.

A closure is a nested function that can access variables in the scope of the outer function. Its advantages include data encapsulation, state retention, and flexibility. Disadvantages include memory consumption, performance impact, and debugging complexity. Additionally, closures can create anonymous functions and pass them to other functions as callbacks or arguments.

The relationship between js and vue: 1. JS as the cornerstone of Web development; 2. The rise of Vue.js as a front-end framework; 3. The complementary relationship between JS and Vue; 4. The practical application of JS and Vue.

Go language function closures play a vital role in unit testing: Capturing values: Closures can access variables in the outer scope, allowing test parameters to be captured and reused in nested functions. Simplify test code: By capturing values, closures simplify test code by eliminating the need to repeatedly set parameters for each loop. Improve readability: Use closures to organize test logic, making test code clearer and easier to read.

Yes, code simplicity and readability can be optimized through chained calls and closures: chained calls link function calls into a fluent interface. Closures create reusable blocks of code and access variables outside functions.

The impact of function pointers and closures on Go performance is as follows: Function pointers: Slightly slower than direct calls, but improves readability and reusability. Closures: Typically slower, but encapsulate data and behavior. Practical case: Function pointers can optimize sorting algorithms, and closures can create event handlers, but they will bring performance losses.