js types of Bool conversion

Do all 3 ways use the same conversion to bool?

function check(variable){
    let b1 = Boolean(variable);
    let b2 = !!variable;
    let b3 = variable ? true : false;
    
    return b1 === b2 && b2 === b3;
}

>Solution :

Do all 3 ways use the same conversion to bool?

Yes. The Boolean function, the logical NOT operator and the conditional operator all convert the value to a boolean value via the internal ToBoolean algorithm:

(of course engines are free to implement it however they want, but it has to behave like the spec dictates)