Joining two strings with a comma and space between them

Simply

return str1 + ", " + str2;

If the strings are in an Array, you can use Array.prototype.join method, like this

var strings = ["a", "b", "c"];
console.log(strings.join(", "));

Output

a, b, c

try this:

 function test(str1, str2) {

     var res = str2 + ',' + str1;

     return res;

 }

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