Is there a programming language that allows programming in debug mode?

Question

Debugging

Many languages ​​have the ability to run a program in debug mode. Those. the program is executed in steps and you can view the values ​​of the variables.
But not all PLs support changing the program in this mode. There is also no way to go back a step.

The question is, is there such a programming language that allows you to change the program code immediately in debug mode, as well as return to previous program steps?

PS It is better if it is not a functional PL, but it is also interesting to learn about the functional one.

Answer 1

Those. the program is executed step by step and you can view the values ​​of the variables.

Yes, only this is not done by the programming language, but by the debugger .

Answer 2

This question is not about the language, but about the toolkit, in particular, interactive shells. For example Jupyter ; supports most programming languages, meaning you can do what you wrote in the question in C++, C#, Java, JavaScript, Python, and so on.