How does adding String with Integer work in JavaScript? [duplicate]

Answer 1

1. This is a string not a number--""
2. This is a string not a number--"1"
3. This is a string not a number--"1" <+> "10" = "1"+"10" = "110"'
4. This is a string not a number--"1" <+> "10" <+> "2" = "1"+"10"+"2" = "1102"
5. This is a number because there's no confusion about a minus operator--1102 - 5 = 1097
6. This is a string not a number--"1097" <+> "8" = "1097"+"8" = "10978"

SNIPPET

document.getElementById("1").innerHTML = "";

document.getElementById("2").innerHTML = "" + 1;

document.getElementById("3").innerHTML = "" + 1 + 10;

document.getElementById("4").innerHTML = "" + 1 + 10 + 2

document.getElementById("5").innerHTML = "" + 1 + 10 + 2 - 5

document.getElementById("6").innerHTML = "" + 1 + 10 + 2 - 5 + "8";