- separator (optional): the separator to be used when concatenating elements in a string value. If an empty string is passed as a method parameter, the array elements will be joined into one string without using a separator. The default value is comma ",".
To join array elements to a string, you can also use a "for loop". Please note that this method is slower and takes an additional memory space.
The string.split() method is the opposite of the array.join() method and is used to split the given string into an array of strings using the provided delimiter. The main difference between the join() and split() methods is that the join() method is used to join array elements into a string, while the split() method is used to split a string into an array.