Converting calculation string to int in Lua

Question

I\'m trying to get a string with multiple numbers to a single int like this:

x=\"5+5\"  --amount of numbers is not constant
y=tonumber(x)
print(y) 

Answer 1

tonumber can be used only on a string that is a real number, not an arithmetic expression.

You can load the string and run it:

x = "5 + 5"
func = assert(load("return " .. x))
y = func()
print(y)

In Lua 5.1, use loadstring instead of load.