Js classes problem

Question

class enemy {
constructor (height, strength) {
this.height = height
this.strength = strength
}
let chris = new enemy (100, 50)
let {prop1, prop2} = chris
console.log (prop1 + prop2)

Why this outputs NaN? Shouldnt it output 150?

Answer 1

class enemy {
constructor(height, strength) {
this.height = height;
this.strength = strength;
}
}
let chris = new enemy(100, 50);
let {height, strength} = chris;
console.log(height+strength); => 150

or,

class enemy {
constructor(height, strength) {
this.height = height;
this.strength = strength;
}
}
let chris = new enemy(100, 50);
let {height:prop1, strength:prop2} = chris;
console.log(prop1+prop2); => 150

prop1 and prop2 are not properties of object so they both are undefined and adding prop1 and prop2 results NaN

Answer 2

if you want to store height in prop1 and strength in prop2 by destructuring you should do:

let {height:prop1,strength:prop2} = chris;
console.log(prop1+prop2); // 150