TodayILearned - 2023-07-04

NaN === NaN

• The only value/data type that does not return ‘true’ during equality comparison
• If you want to check whether a variable’s value is NaN, use isNaN() (e.g. isNaN(10)).

0 === -0 and 0 == -0

• This will return true

Object.is()

• Alternatively, Object.is() is a method that determines whether two values are the same value
• Object.is(NaN, Nan) will return true
• Conversely, Object.is(-0, +0) will return false

typeof foo === null

• using typeof for a null value will return “object”
• If you want to check whether a value is null type use === (e.g. foo === null)