CODEWITHSUNDEEP
lua
pravin chavan
pravin chavan

Reputation: 43

how to count number of sub array in lua string

how to count number of sub array in lua string.

I have a lua string in following format,

{{"engName1":"Test1","validDurPeriod":0,"appStatus":2,"engName3":"", "ExtraInfo":{"returnPeriod":7,"stayType":50,"fingerprintInd":49,"stayPeriod":6,"medicalInd":49},} {"engName1":"Test2","validDurPeriod":3,"appStatus":2,"engName3":"", }, {"engName1":"Test3","validDurPeriod":2,"appStatus":2,"engName3":"","ExtraInfo":{"returnPeriod":7,"stayType":50,"fingerprintInd":49,"stayPeriod":6,"medicalInd":49} }, {"engName1":"Test4","validDurPeriod":3,"appStatus":2,"engName3":"", },}

I want to count number of sub arrays in lua string , something like {{},{},{},{}} as here count is 4

I tried something below code to check its contains array but not able to get the exact count. below code is working for single array but not working for multiple array 

function checkType(sample)

if string.startswith(sample, "{{", true) or string.startswith(sample, "{ {", true)  or string.startswith(sample, "{  {", true) then
 return true;
else
return false;
end
end

Upvotes: 2

Views: 667

Answers (2)

semkeijsper
semkeijsper

Reputation: 314

If your table works correctly, you should be able to use the function table.getn(table).

Examples:

print(table.getn{10,2,4})          --> 3
print(table.getn{10,2,nil})        --> 2
print(table.getn{n=1000})          --> 1000

a = {}
print(table.getn(a))               --> 0

I hope that does the trick ;)

Source: 19.1 - Array Size

Upvotes: 0

lhf
lhf

Reputation: 72312

If s contains your string, then n below contains the count:

local _,n=s:gsub("[^{}]",""):gsub("{}","")

Upvotes: 1

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