an explaination about this JS code, please...

Question

var one =[2,4];
var two =[1,3];
var set =one+two; //set=[2,41,3]
alert (set.length);

output >> 6 // ?!?

Answer 1

Oneill :D
adding (also alerting using alert(obj)) objects envokes their toString() method. arrays are also objects in js.

first array is converted to => "2,4"
second converted to =>"1,3"

on addition the strings are conactenated "2,41,3"

final product is obviously a string not an array so obviously commas , will also be counted as charecters.

printing length property of "2,41,3" string you get 6 🤝

edit{
see this post by everything.js :
https://www.sololearn.com/post/161927/?ref=app
}

Answer 2

thx guys. I understood.
I forgotten the type value