The Array.join() method allows you to combine an array into a single string. By default each element from the array will be separated by a comma in the returned string. Here’s a very simple example of it’s usage.
const names = ['Bill', 'Ben', 'Beth'] console.log(names.join()) // Bill,Ben,Beth
It’s also possible to pass the
join method a parameter to override the delimiter. For example if we wanted to instead have each element separated by an empty space we could do the following.
const names = ['Bill', 'Ben', 'Beth'] console.log(names.join(' ')) // Bill Ben Beth
If there are no elements in the array
join will return an empty string.
const names =  const joined = names.join() // joined = ''