JAVASCRIPT ,node.js, ES6 [требует правки]

What is the output of following codes and why

1. [] + {}
2. {} + []
3. ({} + [])

What is the output of following codes

1. typeof undefined
2. typeof null

What is the output of following codes and why

for (var n = 1; n <= 5; n++) {
    setTimeout(() => console.log(n), 0)
}