Some more tables.
%cat tex.lua
person = {}
person["First"] = {
name = "Girish here",
birthyear = 1906,
deathyear = 1978,
}
person["Second"] = {
name = "Some other Name",
birthyear = 1898 ,
deathyear = 1972,
}
for variable, person in pairs(person) do
print( variable, person.name )
print( variable, person.birthyear )
print( variable, person.deathyear )
print()
end
print("Now sequential..")
table.sort(person)
for variable, person in pairs(person) do
print( variable, person.name )
print( variable, person.birthyear )
print( variable, person.deathyear )
print()
end
person = {}
person[3] = {
name = "Girish here",
birthyear = 1906,
deathyear = 1978,
}
person[1] = {
name = "Some other Name",
birthyear = 1898 ,
deathyear = 1972,
}
table.sort(person)
for variable, person in pairs(person) do
print( variable, person.name )
print( variable, person.birthyear )
print( variable, person.deathyear )
print()
end
Now for output:
%lua tex.lua
Second Some other Name
Second 1898
Second 1972
First Girish here
First 1906
First 1978
Now sequential..
Second Some other Name
Second 1898
Second 1972
First Girish here
First 1906
First 1978
1 Some other Name
1 1898
1 1972
3 Girish here
3 1906
3 1978
----------------------------
We see that the function table.sort() has no effect in the previous case. Why?
It can only sot tables with numeric indices. It does not do string sorting.
And the other statements must be familiar. We define two tables and
these two tables
are contained within another table. So it is multi dimensional tables.
The pairs() function takes a table and returns the key and value.
First we obtain the key and value for the global table person{} and then
we look at the two tables, person["First"] and person["Second"]
-Girish
--
Gayatri Hitech
http://gayatri-hitech.com
