Attribute & Method vs Variable & Function

calculator.js

//////////// Object oriented programming

console.log('Calculator:');

let calculator = {
  // attribute "result" of calculator object
  result: 0,

  // method "add()" of calculator object
  add: function (number) { 
    this.result += number; 
  },
}

calculator.add(2)
calculator.add(5)
console.log(calculator.result);


////////////// Functionnal programming

console.log('Function:');

// function "add()""
function add(number1, number2) {
  return number1 + number2;
}

// variable "result"
let result = 0;
result = add(result, 2)
result = add(result, 5);
console.log(result);