Simple es6 lexical this vs that=this/.bind(...) example

lexThis.js

function CoolObject() {
  var that = this;

  // Allows us to use lexical this as opposed to .bind or that = this trick
  this.coolPromise = new Promise((resolve, reject) => {
    console.log(this === that);
    setTimeout(() => {
      resolve(10);
    }, 2000);
  });
  
//   this.coolPromise = new Promise(function(resolve, reject) {
//     console.log(this === that);
//     setTimeout(() => {
//       resolve(10);
//     }, 2000);
//   }.bind(this));
}

const coolObj = new CoolObject();

coolObj.coolPromise.then(v => {
  console.log(v);
  console.log(this == window);
});