function declaration

var sum = function (n1 ,n2)
{
return n1+n2;
}
console.log(sum(23,34));

function sum2(n2,n3)
{
console.log(n2+n3);
}
sum2(23,54)

var sum3 = (n1,n2) => n1+n2;
console.log(sum3(545,65));