-- A guided tour of Lua running on calog.
-- Demonstrates: local variables, a function, a numeric for loop building a
-- table, iterating that table, then cryptoHashSha256 and jsonStringify natives.
-- Run: bin/calog examples/scripts/languages/lua.lua

-- A local variable.
local squareCount = 6

-- A function.
local function square(n)
    return n * n
end

-- A numeric for loop that builds a table of squares.
local squares = {}
for i = 1, squareCount do
    squares[i] = square(i)
end

-- Iterate the table and print each element.
local total = 0
for i, v in ipairs(squares) do
    calogPrint("square of", i, "is", v)
    total = total + v
end
calogPrint("sum of squares 1..6 =", total)

-- Hash a string with the crypto native.
local message = "calog loves Lua"
local digest = cryptoHashSha256(message)
calogPrint("sha256(" .. message .. ") =", digest)

-- Build a small record and serialize it as JSON.
local record = {
    language = "lua",
    version  = "5.4",
    squares  = squares,
    total    = total,
    digest   = digest
}
calogPrint("json:", jsonStringify(record))

calogExit(0)