goofmint

(function hello() {}).constructor.name
// -> "Function"

goofmint

class Hello {};
const hello = new Hello;
hello.constructor.name;
// -> "Hello"

goofmint

typeof 1
// -> "number"
typeof 0.001
// -> "number"
0.001.constructor.name
// -> "Number"
isNaN(0.001)
// -> false

goofmint

isNaN(1)
// -> false

goofmint

1.constructor.name
// -> Uncaught SyntaxError: Invalid or unexpected token

goofmint

"Hello".constructor.name
// -> "String"
(new Date).constructor.name
// -> "Date"
true.constructor.name
// -> "Boolean"

goofmint

Array.isArray(['a', 'b'])
// -> true

goofmint

Object.prototype.toString.call(['a', 'b']) === '[object Array]'
// -> true

goofmint

typeof new Array('a', 'b')
// -> "object"

goofmint

typeof ['a', 'b']
// -> "object"