Arr3 = arr3.join('') works but not arr3.join('')

1

Hello, I am doing the Basic Algorithm : Confirm the Ending, and found that the below works (arr3 will be be joined without commas) :-

 let arr3 = arr1.slice(diff,check1);
 arr3 = arr3.join('');

but not this (arr3 will still have commas) :-

 let arr3 = arr1.slice(diff,check1);
 arr3.join('');

Is it possible to maybe point me to an article on the reason for this? Thank you.

2

join() returns an array, it doesn’t change the variable on which it is used. ergo, with arr3 = arr3.join('') you are changing arr3, in the other way you are not

2 Likes