> 0.1 + 0.2
0.30000000000000004

> 1 + “23” - 10
“113”

> null == undefined
true

> NaN == NaN
false

> typeof null
"object"

> typeof NaN
"number"

> ['1', '7', '11'].map(parseInt)
(3) [1, NaN, 3]

> function foo() {
    return 
    {
      foo: 'bar'
    }
  }
foo()
< undefined

> function bar() {
  return {
    foo: 'bar'
  }
}
bar()
> {foo: "bar"}

> [] + []
""

> {} + {}
"[object Object][object Object]"

> [] + {}
"[object Object]"

> {} + []
0

> +!+[]
1

3 > 2
true

3 > 2 > 1
false

> function Test() {
}()
Uncaught SyntaxError: Unexpected token )

> var test = function() {}
undefined