JavaScript (5) Truthy and Falsy

1. Falsy:

We say that value is Falsy if that value is coerced to a boolean and return false.

• "" (empty string)
• 0 and -0
• NaN (not a number)
• null
• undefined
• false

2. Truthy:

The value is Truthy if it is not Falsy.#$%^&**^&$%&^#^

• "hello"
• 42
• true
• [ ]
• { }

Reference

[1] Kyle Simpson, You Don't Know JS Series, O'Reilly Media (2014)