"🥑" va "😍"

"🥑" va "😎"

"😍" va "😎"

"😎" va "😎"

123

456

undefined

ReferenceError

{ name: "Lydia", age: 21 }

{ name: "Lydia", age: 21, city: "Amsterdam" }

{ name: "Lydia", age: 21, city: undefined }

"Amsterdam"

"Sorry, you're too young."

"Yay! You're old enough!"

ReferenceError

undefined

"""

"I"

SyntaxError

undefined

NaN

20

ReferenceError

undefined

{ default: function default(), name: "Lydia" }

{ default: function default() }

{ default: "Hello world", name: "Lydia" }

Global object of module.js

"class"

"function"

"object"

"string"

[1, 2, 3, 4, 5]

[1, 2, 3, 5]

[1, 2, 3, 4]

Error