Is there any difference in time complexity between [1,2,3].toString() and [1,2,3].join() . As I understand time complexity of join function is O(n) . What is the time complexity of .toString() method ?

CodePudding user response：

Both have the same time complexity. Array.prototype.toString calls Array.prototype.join without argument. ',' is the default separator.

MDN Spec

CodePudding user response：

toString() has the same time complexity of join(), the difference is that with join() is possible to choose the separator.

array.join([separator]);