Find if an item exists in an array

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Posts: 15
Joined: Wed Jan 13, 2010 2:47 pm

Find if an item exists in an array

Post by juraj » Sun Jan 17, 2010 11:51 pm

I'm having trouble finding an appropriate function for what I want to do. I'm used to using the existence of an item in an array to track things in other clients, and I was hoping that there was a function to do the same in Lua. I'm looking for something that will return 1 or true if a string exists inside a given array, and 0, false, or nil if it doesn't.

>> foo = {"one fish", "two fish", "red fish", "blue fish"}
>> function_I_want_to_use( foo, "one fish")
>> function_I_want_to_use( foo, "lorax")

something along those lines

Posts: 13
Joined: Wed Dec 09, 2009 7:01 pm

Re: Find if an item exists in an array

Post by davidk » Mon Jan 18, 2010 1:22 pm

The fastest way would be to use your item names as keys, e.g.
foo = { ["one fish"] = true, ["two fish"] = true, ...}
Then you can test for the existence using the expression foo["one fish"].
If for some reason you cannot have such a lookup table you would have to use the pairs function to iterate through the whole table.

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