How to add a comma separator after each params if param has values and dot in the end of params

for example we have 3 params

function test(a,b,c){
  console.log(a + ',' + b + ',' + c +'.')
}

test('a','b','c')

will print

> a, b, c.

but in case b will be empty, the result will look with two comma, like

test('a','','c')

will print

a,,c.

we can improve like checking each var like this

function test(a,b,c){
      console.log(a + (a?',':'') + b + (b?',':'') + c +(c?'.':''))
    }

so now

 test('a','','c')

will print

a,c.

look ok, but when we have only b

test('','b','')

will print

  b,

and now we must to check values a or b exist and there is no c to print '.'

and complexity increases, but what if we have n vars, any ideas how to solve more easily

expected result is :

test('a','b','c') => a, b, c.
test('a','b','') => a, b.
test('a','','') => a.
test('','b','c') => b, c.
test('','b','') => b.
test('','','') => 

>Solution :

You can filter and use the …rest parameter

const isParm = prm => prm !== "" && prm !== undefined && prm !== null;

const test = (...theArgs) => {
  const list = theArgs.filter(parm => isParm(parm)); 
  if (list.length > 0) console.log(`${list.join(",")}.`)
}

let x; 
test('a','b','c')
test('a',null,'c'); // null is a falsy value
test('','','c')
test('a')
test('','b')
test(x); // undefined (falsy)
test(0,0,0); // falsy values