Boolean

const x = new Boolean(false);
if (x) {
  // 
}

const x = false;
if (x) {
  // 
}

const x = Boolean(expression); // use this...
const x = !!expression; // ...or this
const x = new Boolean(expression); // don't use this!

const myFalse = new Boolean(false); // initial value of false
const g = Boolean(myFalse); // initial value of true
const myString = new String("Hello"); // string object
const s = Boolean(myString); // initial value of true

if ([]) {
  console.log("[] is truthy"); // logs "[] is truthy"
}
if ([] == false) {
  console.log("[] == false"); // logs "[] == false"
}

const bNoParam = new Boolean();
const bZero = new Boolean(0);
const bNull = new Boolean(null);
const bEmptyString = new Boolean("");
const bfalse = new Boolean(false);

const btrue = new Boolean(true);
const btrueString = new Boolean("true");
const bfalseString = new Boolean("false");
const bSuLin = new Boolean("Su Lin");
const bArrayProto = new Boolean([]);
const bObjProto = new Boolean({});