True, but var and let are not same in js, so there is three.

if(true) {

var a = "dumdum"

}

console.log(a)

Is valid and functioning javascript. With let it is not.

C# has const string a = “Hello, World”;

var in js is legacy, and default should be let, but changing that would break everything

Damn! Same here, red hat 99, but switched to Debian quite fast