Append commas only if strings are not null or empty in JavaScript

Today, we’ll show you how to append commas only if strings are not null or empty in JavaScript.

Here, we will use the join Array method with comma delimiter to concat the strings. But we will also add one more check to filter the empty or null records.

const addressLine1 = "Address Line 1";
const addressLine2 = "";
const city = "City";
const state = "State";
const postcode = null;
const country = "Country";

Join strings using a comma

Let’s combine the above strings using the join() method and check the output log.

const output = [addressLine1, addressLine2, city, state, postcode, country].join(", ");
console.log(output);
// Address Line 1, , City, State, , Country

You may have noticed that we have multiple commas next to each other when values are empty or null. So use the following code to avoid it.

const output = [addressLine1, addressLine2, city, state, postcode, country].filter(Boolean).join(", ");
console.log(output);
// Address Line 1, City, State, Country

In the above code, we have used the .filter(Boolean) (which is the same as .filter(x => x)) to remove all falsy values (null, undefined, empty strings etc).

I hope you find this article helpful.
Thank you for reading. Happy Coding..!!