What are some programming languages that use dynamic scoping?

What are some programming languages that use dynamic scoping?

Dynamic scoping is a feature where a variable's scope is determined at runtime. Some languages that use dynamic scoping include Perl, Emacs Lisp, and some versions of Bash.

Can you explain how dynamic scoping works in these languages?

Sure! In dynamic scoping, when a variable is referenced, the interpreter looks for its value in the current function's call stack, rather than just in the local scope. This means that if a variable is defined in a calling function, it can be accessed in the called function.

What are the advantages and disadvantages of dynamic scoping?

Advantages include flexibility and ease of use in certain scenarios. Disadvantages are potential confusion and difficulty in tracking variable values, which can lead to bugs.

Are there any languages that primarily use lexical scoping instead?

Yes, many modern programming languages like JavaScript, Python, and Java primarily use lexical scoping, where the scope is determined by the physical structure of the code.