A Guide to the S-Lang Language: Future Directions

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## 19. Future Directions

Several new features or enhancements to the S-Lang language are planned for the next major release. In no particular order, these include:

- An interactive debugging facility.
- Function qualifiers. These entities should already be familiar to VMS users or to those who are familiar with the IDL language. Basically, a qualifier is an optional argument that is passed to a function, e.g., `plot(X,Y,/logx)`. Here `/logx` is a qualifier that specifies that the plot function should use a log scale for `x`.
- File local variables and functions. A file local variable or function is an object that is global to the file that defines it.
- Multi-threading. Currently the language does not support multiple threads.

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