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Lua operators, why isnt +=, -= and so on defined? In Lua's case, the language is intended to be an embedded scripting language, so any changes that make the language more complex or potentially make the compiler runtime even slightly larger or slower may go against this objective If you implement each and every tiny feature, you can end up with a 'kitchen sink' language: ADA, anyone?
if statement - How to check if a value is equal or not equal to one of . . . Because control structures in Lua only consider nil and false to be false, and anything else to be true, this will always enter the if statement, which is not what you want either There is no way that you can use binary operators like those provided in programming languages to compare a single variable to a list of values
resources - Lua, what is Lua? - Stack Overflow Lua is a powerful, fast, lightweight, embeddable scripting language Lua combines simple procedural syntax with powerful data description constructs based on associative arrays and extensible semantics