things would be evaluate as true/false in if condition and the boolean operators ( && / || )

if (123) {
	return true;
} else if (null) {
	return false;
};

these values or types would be converted into false or truthy

Variable Type when it is falsy when it is truthy
boolean false true
string '' (empty string) any other string
number 0 NaN any other number
null always never
undefined always never
Any other Object including empty ones like {},[] never always

Being explicit

use !!

The first ! convert a value into boolean type but inverts the logic. The second one toggles it again to mathc the nature of the original obkect

// Direct variables
const hasName = !!name;

// As members of objects
const someObj = {
  hasName: !!name
}

// e.g. in ReactJS JSX
{!!someName && <div>{someName}</div>}