How do you count the index of a string in JavaScript?

Question

For instance, the code below outputs 8 but I really don't understand why it gives 8 as the output

var str = "This is SoloLearn";
var pos = str.indexOf("Solo");
alert(pos++);

Answer 1

Mofey
Solo start position at 8.
8th position is S.
javascript start count 0.

Answer 2

It gives 8 as the output since the index of any string starts with 0.
The index of "Solo" is 8 so the pos variable will store 8 and display it and after that it will increment the pos value since
pos++ is a post increment operation , firstly the value will be assigned then it will be incremented

Answer 3

Welcome Mofey ☺

Answer 4

Oh, thank you so much <rabby> </ahad> At least I can say I've learnt something new today