"État de ce qui est ambigu, qui peut être compris dans deux sens différents ou plus."

eval('{}')

> undefined

> Object {}

eval(`{
 talk:"BreizhCamp"
}`)

> Object{talk:"BreizhCamp"}

eval('{} + {}')

> NaN

> "[object Object][object Object]"

// A line start with a '['
[1, 2, 3].forEach(console.log)

// A line start with a '('
(function() { console.log('IIFE') }())

var a = 0
(function() { console.log('IIFE') }())

var a = 0
[1, 2, 3].forEach(console.log)

> TypeError: Cannot read property
  'forEach' of undefined

> TypeError: 0 is not a function

// A line start with a '`'
`Hello BreizhCamp`

var a = 0
`Hello BreizhCamp`

> TypeError: 0 is not a function

// A class method start with *
class A {
  *hello() {}
}

// A class method start with *
class A {
  message = 'world'
  *hello() {}
}

> Unexpected token, expected (4,11)