What is the difference between link and import?

The difference between link and import is: 1. Link is a keyword used to connect a code library or object file to an executable file during static linking, while import is a dynamic link at runtime. Keyword for loading external modules or libraries; 2. The main function of link is to combine different code modules into a whole so that they can be executed together at runtime. The main function of import is to introduce external modules at runtime for use in the program. its function.

Operating system for this tutorial: Windows 10 system, Dell G3 computer.

link and import are two keywords commonly used in programming, used to introduce external code or modules. Although their purpose is similar, there are some differences in usage and functionality.

First of all, link is a keyword used to connect a code library or object file to an executable file when linking statically. It merges external code with the main program at compile time to create a single executable file. This means that linking is done during the compilation phase, and once the code is linked, it becomes part of the executable and does not need to be referenced again. The main function of link is to combine different code modules into a whole so that they can be executed together at runtime. This approach is commonly used in traditional programming languages ​​such as C and C++.

In contrast, import is a keyword that dynamically loads external modules or libraries at runtime. It is commonly used in interpreted languages ​​such as Python and JavaScript. The import statement allows a program to load specific modules or libraries as needed at runtime. This approach allows the program to use external code more flexibly, and modules can be dynamically loaded or unloaded as needed. The main function of import is to introduce external modules at runtime so that their functions can be used in the program.

Another difference is that link is usually static, while import is dynamic. Static linking means merging all dependent code into one executable file at compile time, so that the program does not need to load external code again when running. Dynamic import allows the program to load or unload modules as needed during runtime, making the program more flexible and extensible.

In addition, link is usually used to connect larger code libraries or object files, while import is usually used to load smaller modules or libraries. Since link combines all code into one executable file, it is suitable for larger projects and can improve execution efficiency. Import is suitable for smaller modules or libraries, which can be loaded or unloaded as needed to reduce memory usage and improve performance.

To summarize, link and import are two different keywords used to introduce external code or modules. link merges code into the executable file at compile time, while import dynamically loads modules at runtime. Their main difference is the static nature of linking and the flexibility of dynamic imports. Depending on the specific programming language and project needs, it is important to choose the appropriate keywords to introduce external code.

The above is the detailed content of What is the difference between link and import?. For more information, please follow other related articles on the PHP Chinese website!