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Reading a file and creating a table
Tables and the table library. example from a Well House Consultants training course
More on Tables and the table library. [link]

This example is described in the following article(s):
   • Lua Tables - [link]

Source code: tinies Module: U105
--[[ Demonstration of fundamental use of tables in Lua.

This example uses both indexed and keyed tables in reading a file
of data, splitting each incoming line into fields, sna storing some
of the extracted information into a table.

]]


fyle = io.open("railstats.txt","r")
rabbits = {}

while true do
        lyne = fyle.read(fyle)
        if (not lyne) then break end

-- Next bit will make a nice function later ;-)

        parts = {}
        current = 1
        while true do
                sep = string.find(lyne,"\t",current)
                if (not sep) then
                        part = string.sub(lyne,current)
                        parts[#parts+1] = part
                        break
                end
                part = string.sub(lyne,current,sep-1)
                current = sep + 1
                parts[#parts+1] = part
        end

-- Now make use of that data

        thisyear = tonumber(parts[9])
        if (thisyear and thisyear < 250) then
                rabbits[parts[7]] = thisyear
        end
end

for k,v in pairs(rabbits) do
        print (v,k)
end

--[[ Sample Output

munchkin:lm12 grahamellis$ lua tinies
21 Gainsborough Central
137 Kirton Lindsey
72 Tees-Side Airport
53 Breich
130 Stanlow & Thornton
236 Dorchester West
128 Upper Tyndrum
117 Pilning
141 Lakenheath
131 Dunston
173 Helensburgh Upper
59 Coombe
40 Dorking West
198 Achanalt
165 Kildonan
212 Scotscalder
108 Falls Of Cruachan
29 Buckenham
106 Pontefract Baghill
246 New Clee
182 Clifton
26 Shippea Hill
187 Hubberts Bridge
59 Sugar Loaf
65 Golf Street
28 Barry Links
161 Chapelton
192 Thorne South
171 Altnabreac
munchkin:lm12 grahamellis$

]]

Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Lua
 * Lua Programming
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This example comes from our "Tables and the table library." training module. You'll find a description of the topic and some other closely related examples on the "Tables and the table library." module index page.

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