true, even a string like
"hello" could be true!
I always suggest to compare values using
=== instead of
== as there is a minor difference between them.
=== checks that the value matches, but also that the type matches.
== checks the value, but not the type.
However, when working with external data, such as from an API, you could sometimes receive
true as a value, or
Let's get to the point.
! // negation operator the type returned is boolean. So a trick to easily switch any value to an actual boolean is to negate it!
Here's an example.
const isTruthy = !0 const isFalsy = !1
Another way which could be easier to reason is to use a double negation operator
const isTruthy = !!1 const isFalsy = !!0
Let's hope that the next API you work with gives you real boolean values so you won't have to use this.