functions and closure in lua

Faq.txt

Q1. Do we need to define the return type while defining a function ?
ans: No,There is no nedd to define a return type ofr a function in lua.

Q2.What is a variadic function in lua?
ans: variadic function are those function which accepts unknown number of arguments.

Q3.What is anonymous function in lua?
Ans: Anonymous function are those function which have body but doesn't have a name.

Q4.Does closure have access to all the locak variable in the program?
ans: No , closure will have only access to the local varible of the enclosing function.

Mcq.txt

Q1.    function prt()
          print("Hello pepcoder")
      end

      for i = 1,3,2 do
          prt()
      end

How many times " hello pepcoder" will be printed:

a)1
b)2
c)3
d) none

ans: b)


Q2.What will be the output of the code :

      function prt(...)
          for i,v in ipairs{...} do
              io,write(i*v," ")
          end
      end

      prt(1,2,3,4,5,6)
      
a) 1 4 9 16 25 36
b) 0 2 6 12 20 30
c) 0 1 2 3 4 5 6
d) 1 2 3 4 5 6 7

ans: a)


Q3. What will be the output of this statements :
    
      function prt(...)
          local sum=0
          return function(...)
              for i,v in ipairs{...} do
                  sum=sum + v
              end
              return sum
          end

      end

      f=prt(1,2,3,4,5,6)
      print(f(1,2,3,4,5))
      
a) 21
b) 15
c) will return function
d) none of the above

ans: b)

Q4. function counter()
        local c=10

        return function()
            c=c-1
            return c
        end
    end

    c1=counter()
    print(c1()) 
    print(c1()) --> line 1

What will be output of line 1

a) 10
b) 11
c) 8
d) 9

ans: c)