Examples explain the difference between pair and ipair in Lua

function print_contents(params) 
    for k, v in pairs(params) do 
        print(k, "  ", v) 
    end 
end 
 
print_contents({20, 40, 50}) 

local tt =   
{   
    [1] = "test3",   
    [4] = "test4",   
    [5] = "test5"   
}   
 
 
for i,v in ipairs(tt) do   -- Output "test3" disconnected when k=2, because the following table of the array is not continuous, i starts from Table 1 below, and it happens to have three elements, resulting in the output when i = 3
    print( tt[i] )   
end  
 

function print_inpaircontents(params) 
    for k, v in ipairs(params) do 
        print(v) 
    end 
end 
 
local temp_table = { 
    [1] = "test3",   
    [2] = "test4",   
    [3] = "test5"  
} 
 
print_inpaircontents(temp_table)