Basic stuff I've been doing wrong in javascript

doYouEvenJS.js

/* is a great practice to use strict to 
force all variables to be declared */
"use strict";

// use const to declare important unchanging variables
const pi = 3.141592653589793;

// declare the damn thing with let, not just var
let greeting = "Hello";

// concatenate strings using inverted accent mark (is that even a thing?)
console.log(`Hey, ${greeting}`); 

// a cool way to swtich from true to false
let is_paid = true;
is_paid = !is_paid;

// how to create a simple object
let person = {
  firstName: ‘Damian’,
  lastName: ‘Medina’
};

// is a good practice to always use === instead of == 
console.log('1' === 1); // false

// how to embed functions within objects
let person = {
  name: ‘Damian’,
  age: 32,
  showName: function() {
    alert(this.name);
  }
};
person.showAlert();