Truthy and Falsy in Javascript

In JavaScript, a truthy value is a value that is considered true when encountered in a Boolean context. All values are truthy unless they are defined as falsy (i.e., except for false, 0, -0, 0n, "", null, undefined, and NaN).

Truthy values include:

• "non-empty string"

• {}

• []

• 'false' (as a non-empty string)

• 42 (or any non-zero number)

• new Date()

• -42 (or any non-zero negative number)

• 3.14 (or any non-zero number)

• Infinity

• -Infinity

• true

• Promise.resolve()

• Symbol()

• () => {}

Falsy values include:

• false

• 0

• -0

• 0n (BigInt zero)

• "" (empty string)

• null

• undefined

• NaN

Any variable that contains these values would be considered falsy when converted to a Boolean. You can test this by using the Boolean() function or a double NOT operator !! in JavaScript. For instance, Boolean(null) or !!null would return false

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