Re: Documenting Lua gotchas for newbies.
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- Subject: Re: Documenting Lua gotchas for newbies.
- From: Dirk Laurie <dpl@...>
- Date: Wed, 8 Dec 2010 11:27:28 +0200
Here is a function that reads up to 10 numbers from a line:
function setup(line)
local data = {}
while #data<10 do
for w in line:gmatch("[^%s]+") do
table.insert(data,(assert(tonumber(w),"Error")))
for k=1,#data do print(k,data[k]) end
break
end
end
E.g.
> setup("2 2 4 4 0 6 0 0")
1 2
2 2
3 4
4 4
5 0
6 6
7 0
8 0
Now, small change, remove the parentheses around the assertion.
table.insert(data,assert(tonumber(w),"Error"))
Guess what happens before trying it!
Is this a newbie gotcha?
Dirk