Can i check if a dictionary has a key

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#1

I have two dictionaries, one is a template and the other needs to fit the template. I want to check on one of the dictionaries to see if it has all the keys the template has.

I tried making a for loop through all values in the template then checking if the dictionary to change doesn’t have the key but checking if the key = nil in the dictionary. However when i do this i get an error

“attempt to index nil with ‘key’”

Does anybody know how to check if a dictionary has a key and value…

#3

thats what i tried and i got the error, i only got the error when it doesn’t exist

#5

i tried it before and got the same results, yeah

#6

Like what @Mixu_78 said, you can check if the key exists but indexing the table and checking if it is different from nil.

local foo = {  };

if foo[ "lol" ] ~= nil then --just in case you are using a boolean: false
       
end

your error means you are indexing foo but it is nil.

local foo = nil;

if foo[ "lol" ] ~= nil then -- Error: attempt to index nil with ‘lol’
       
end

Also you mentioned templates, the AeroFramework ArrayUtlity module contains a function which is most likely what you are looking for.

3 Likes
#8

sorry to the both of you, i was using a datastore for this and when i retrieved data from a player that previously had no data the user didn’t have a dictionary to begin with it was just nil. I just had to declare it as a table first. Thanks for your help though

#9

MARK AS SOLUTION!! This answered my question either way

#10

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