Using os.time, os.date, os.difftime, UTC formatting, and calendar arithmetic in Lua.

Searching, capturing, replacing, and iterating over text with Lua patterns.

Lexical scope, captured variables, higher-order functions, callbacks, and closure pitfalls in Lua.

Conditions, while and repeat loops, numeric and generic for loops, break, return, and goto in Lua.

Lexical scope, local declarations, shadowing, blocks, and variable lifetime in Lua.

Reading and writing files with Lua's simple and complete I/O models.

Definitions, multiple returns, variadic arguments, named arguments, recursion, and tail calls in Lua.

Creating, indexing, iterating, inserting, removing, sorting, and comparing Lua tables.

String literals, immutability, concatenation, conversion, library functions, bytes, and UTF-8 in Lua.

Integer and floating-point values, operators, conversions, ranges, random values, and precision in Lua.