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Types and Values In Corona

Lua is a dynamically typed language. This means that variables do not have types; only values do. There are no type definitions in the language. All values carry their own type.
All values in Lua are first-class values. This means that all values can be stored in variables, passed as arguments to other functions, and returned as results.
nil — it usually represents the absence of a useful value.
boolean — represents two conditions 'false' or 'true'
number — represents real (double-precision floating-point) numbers.
string — represents arrays of characters. Lua is 8-bit clean: strings can contain any 8-bit character,   including embedded zeros.
function — click here to get more details
table — the sole data structuring mechanism in Lua.
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