What kind of programming language allows for variable type flexibility?

A programming language that allows for variable type flexibility is characterized by its ability to determine the type of a variable at runtime rather than at compile time. This means that you can assign different data types to the same variable during the execution of the program without any restrictions on type consistency.

Dynamically typed languages support this flexibility, enabling developers to write code that is typically shorter and more flexible, as they can focus on writing functionality without explicitly defining types for every variable in advance. This feature is particularly beneficial in scenarios where the types of variables may change based on user input or other runtime conditions, allowing for more adaptive and less restrictive coding practices. Examples of dynamically typed languages include Python, JavaScript, and Ruby.

In contrast, statically typed languages require the programmer to declare a variable's type upfront, leading to stricter type enforcement throughout the code. This approach can enhance performance and safety by catching type-related errors at compile time, but it does limit flexibility. Low-level languages focus on hardware interactions and operations close to machine code, while structured languages emphasize organizational principles for writing code but do not inherently relate to the aspect of type flexibility.