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In general, make one small change at a time, do a run show-preview, and save after a few good changes to have a version to restore, in case terrible errors occur after numerous later changes. Note: the saving of a working copy can be done to an offline text file, rather than saving each version into the module revisions.
For example, if you set q = mw. ustring. gmatch (text, "(x.)") in the same module, you can pull characters from the same piece of text (text) by evaluating d=q() without losing your place in a(). Tail calls offer substantial benefits in performance for those who master the language.
Help:Lua for beginners; Help:Lua debugging – about debugging Lua modules; Wikipedia:Lua style guide – standards to improve the readability of code through consistency; Module:Sandbox provides a pseudo-namespace for experimenting with Lua modules
Almost any problem which occurs when running a Lua module will be reported as "Script error" during program execution, such as invalid data or a misspelled variable name in the Lua source code.
I mentioned the 8/4 input because current Lua source that happens to have tabs (because it was prepared somewhere else and was pasted into the edit window) should be using 8-column tabs (an example being Module:Convert/data), while someone writing a new module in the new CodeEditor will get 4-character column tabs if they press the Tab key. A ...
LuaTeX is a TeX-based computer typesetting system which started as a version of pdfTeX with a Lua scripting engine embedded. After some experiments it was adopted by the TeX Live distribution as a successor to pdfTeX (itself an extension of ε-TeX, which generates PDFs).
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