How to check if there's any value's in a table?

Can anyone tell me if there is any-way to check if there are any value's in a table? I tried string.len but it give's bad argument #1 to 'len' (string expected, got table) error.

Script:

local TestingTable = {}

for _,v in pairs(script.Parent:GetChildren()) do
    table.insert(TestingTable,v.Name)
    print("Added "..v.Name)
end


while wait() do
    if string.len(TestingTable) > 1 then -- This is the part I need help with
        local testing = script.Parent:FindFirstChild(TestingTable[1])
        table.remove(TestingTable,1)
    end
end

Any help appreciated.