30 lines
851 B
Lua
30 lines
851 B
Lua
local M = {}
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function M.starts_with(str, start)
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return str:sub(1, #start) == start
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end
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function M.ends_with(str, ending)
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return ending == "" or str:sub(-#ending) == ending
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end
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--- Makes a seed from a string.
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-- If the input is a number, it is returned as-is.
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-- If the input is a string and can be converted to a number with tonumber(),
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-- the output of tonumber() is returned.
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-- Otherwise, the string is converted to a number via a simple hashing algorithm
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-- (caution: certainlly NOT crypto-secure!).
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-- @source https://stackoverflow.com/a/2624210/1460422
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function M.makeseed(str)
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if type(str) == "number" then return str end
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if tonumber(str) ~= nil then return tonumber(str) end
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local result = 0
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for i = 1, #str do
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result = (result*91) + (string.byte(str:sub(i, i)) * 31)
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end
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return result
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end
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return M
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