if results is an array, e.g. []

!!results === true

are you saying !!results is different than results? i use

if (results) {

to weed out null values...

FWIW, I almost never use this

!!

coercion to bool... it seems native truthy/falsey covers most use cases for this. The exception for me is if I require a boolean for strong typing (e.g. something in TypeScript requires a boolean). I'd love to hear other ideas on using (or not using)

!!

Right, since boolean operators and if statements coerce values, any code you write using

!!

will likely have the same effects as if you did not use

!!

. I sometimes use it when it knowing that a symbol is a boolean (and not, e.g. an array) improves the clarity of the code, or if I am returning a value from a function the return value should definitely be a boolean and not leak e.g. an array of results.