LUA

lua len array

print(table.getn{10,2,4})          --> 3
    print(table.getn{10,2,nil})        --> 2
    print(table.getn{10,2,nil; n=3})   --> 3
    print(table.getn{n=1000})          --> 1000
    
    a = {}
    print(table.getn(a))               --> 0
    table.setn(a, 10000)
    print(table.getn(a))               --> 10000
    
    a = {n=10}
    print(table.getn(a))               --> 10
    table.setn(a, 10000)
    print(table.getn(a))               --> 10000

lua size of array

> a = {10, 11, 12, 13}
> print(#a)
4