In my lectures i often have simple examples that build progressively over several slides. In order to use klipse properly, but also for clarity, I gneerally repeat variable declarations from slide to slide, so for instance:
** Making Lists (Arrays)
+#NAME: js-array-historians
#+BEGIN_SRC js
let historians= ["Edward Gibbon", "Leopold von Ranke", "Edward Said", "Joan Scott"];
#+END_SRC
** Repetition: While Loops
#+NAME: js-while-hist
#+begin_src js
<<js-array-historians>>
let i = 0;
while (i < historians.length) {
console.log(historians[i] + " was a historian.");
i+=1;
}
#+end_src
There might then be a sequence of another 5 or 6 slides in which the same "historians" array is bound to the same value and used as an example.
This works fine on its own. However, I would also like to tangle all this code to a single file per lecture so students can download a git repo and play with it directly in a real text editor. Unfortunately, _javascript_ will error out if a ~let~ bound variable is redeclared in the same scope. I'm wondering if there's any way to specify that a noweb reference only be included one time in a tangled file. Or if there are cleverer workarounds that folks can suggest!
Thanks much,
Matt