toString() method returns a string representing the specified array and its elements.

toString() method does not accept any parameter.

toString() method returns a string with array values separated by commas.

toString() method does not change the original array.

toString() treats empty slots the same as undefined and produces an extra separator,

['a',, 'b', 'c',, 'd'].toString(); returns ↴

'a,,b,c,,d'