A falsy value is a value considered false if it's encountered in a boolean context.

These are the falsy values:

1. false: The keyword false itself is obviously considered falsy.
2. 0, -0, 0n, -0n: The number zero (including its negative counterpart and big int) is considered falsy.
3. “”, '' and `` (empty strings): An empty string is considered falsy.
4. null: The null keyword is considered falsy.
5. undefined: The undefined keyword is also falsy.
6. NaN: “Not a Number” is considered falsy.

Everything that is not a falsy value is a truthy value.

This includes:

• '0'
• 'false'
• []
• {}
• function () {}