"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

{ constructor: ...} { constructor: ...}

{} { constructor: ...}

{ constructor: ...} {}

{ constructor: ...} undefined

name Lydia and age 21

["name", "Lydia"] and ["age", 21]

["name", "age"] and undefined

Error

["banana", "apple", "pear", "orange"]

[["banana", "apple"], "pear", "orange"]

["banana", "apple", ["pear"], "orange"]

SyntaxError

a is bigger, 6 and b is bigger, 3

a is bigger, undefined and b is bigger, undefined

undefined and undefined

SyntaxError