Array.prototype.every() boolean values

Question

I'm confused by this .every() behavior.

let a = [true, true, true]
a.every(Boolean) //  returns true

let b = [true, false, true]
b.every(Boolean) // returns false

typeof false // returns 'boolean'

I can not understand why b.every(Boolean) returns false . What do i miss ?

Answer 1

From MDN:

The every() method tests whether all elements in the array pass the test implemented by the provided function.

The Boolean callback that you use converts the variable passed to it to a boolean, so Boolean(false) will return false, which makes b.every(Boolean) return false as well.