what is the difference between these two functions?

Question

1;
const chameleon = {
eyes: 2,
lookAround: function () {
console.log(`I see you with my ${this.eyes} eyes!`);
}
};
2:
function whoThis () {
this.trickyish = true
}
chameleon.lookAround();
whoThis();

Answer 1

First example has an object literal with method lookAround.
Second example has a constructor definition.
You can instantiate objects using constructor.
let obj = new whoThis();
alert(typeof obj);