What is the method of implementing code sharing between Android and iOS?

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One method of implementing code sharing between Android and iOS is through the use of cross-platform development frameworks such as React Native or Xamarin. These frameworks allow developers to write code once in a common programming language and then use it to build native apps for both platforms. Another method is through the use of web technologies such as HTML, CSS, and JavaScript to create hybrid apps that can run on both platforms. Additionally, some cloud-based tools and services can be used to automate the process of generating code for both platforms.