Inconsistent typeof

[d.healey]

I would expect the console output of this code to be number : number. But for some reason if I don't initialize the array element it increments it and turns it into a string.

const var foo = [];
const var bar = [0];

foo[0]++;
bar[0]++;

Console.print(typeof foo[0] + " : " + typeof bar[0]);

[Christoph Hart]

If you google "Javascript weirdness", that's just the tip of the iceberg...