Array implementation of a stack using push/pop

app.js

//STACK = LAST IN FIRST OUT
const stack = [];

stack.push({"Willow Rosenberg": "A"});
console.log(stack); 
//[{ "Willow Rosenberg": "A" }]

stack.push({"Xander Harris": "C"});
console.log(stack); 
//[{ "Willow Rosenberg": "A" }, { "Xander Harris": "C" }]

stack.push({"Cordelia Chase": "B+"});
console.log(stack); 
//[{ "Willow Rosenberg": "A" },{ "Xander Harris": "C" },{ "Cordelia Chase": "B+" }]

stack.push({"Buffy Summers": "B"});
console.log(stack); 
//[{ "Willow Rosenberg": "A" },{ "Xander Harris": "C" },{ "Cordelia Chase": "B+" },{ "Buffy Summers": "B" }]

//REMOVAL
let firstOut = stack.pop();
// { "Buffy Summers": "B" }
console.log(stack);
//[{ "Willow Rosenberg": "A" },{ "Xander Harris": "C" },{ "Cordelia Chase": "B+" }]

firstOut = stack.pop();
//{"Cordelia Chase": "B+"}
console.log(stack);
//[{ "Willow Rosenberg": "A" }, { "Xander Harris": "C" }]