Why this happpen? Is it a rule in JS?

Question

let a = "+6";
alert(a); // +6
alert(+a); // 6
https://code.sololearn.com/WD2YN22TzBcT/?ref=app

Answer 1

As a string, a is just a text "+6", so that's why it shows the plus sign. +a is a number, and numbers don't show the plus sign, so there will be no plus sign