So I just ran into this issue, and while i've been working Javascript a while now, I didn't realize what seems to be an innate behavior and I'm hoping you guys can help explain when in this is the case. Consider this:
let a = {key1: [1,2,3]};
let b = a.key1;
b.pop(1);
console.log(a); // { key1: [ 1, 2 ] }
It appears that instead of b becoming a copy of a.key1 it is infact passing a pointer to the original data. This causes any changes that I make to b reflect up to a.key1. So my question is where can I read more about this behavior, does this apply for copying solely objects, or does it apply to other things (e.g.arrays, strings).
This is somewhat alarming to me considering code I've written in the past not being aware of this and leaving landmines for myself to find later...
