StringBoolean.js

// just 4 fun & lools

class StringBoolean extends String {
	static get [Symbol.species] () {
		return Boolean;
	}
	get [Symbol.toStringTag] () {
		return 'StringBoolean';
	}
	get [Symbol.toString] () {
		return 'StringBoolean';
	}
	get [Symbol.toPrimitive] () {
		return function (hint) {
			return this.valueOf();
		}
	}
	constructor(value) {
		super(value);
		const {valueOf} = this;
		Reflect.defineProperty(this, valueOf, {
			get () {
				return valueOf.call(this);
			}
		});
	}
	get valueOf () {
		const value = this.toString();
		return function () {
			return this === 'true' || !(this === 'false');
		}.bind(value);
	}
}

console.log('\n');

debugger;
const t = new StringBoolean('true');
debugger;
console.log(t);
console.log(+t);
console.log(-t);
console.log(`${t}`);
console.log(t.valueOf());
console.log(t.toString());

console.log('\n');

debugger;
const f = new StringBoolean('false');
debugger;
console.log(f);
console.log(+f);
console.log(-f);
console.log(`${f}`);
console.log(f.valueOf());
console.log(f.toString());

debugger;
console.log('\n');
console.log('joint t:', Object.prototype.toString.call(t));
console.log('joint f:', Object.prototype.toString.call(f));
console.log('\n');