This calculator app implements ES6 classes: creating a class, defining a constructor, creating properties and methods, accessing class properties and calling methods, etc.
Calculator Class
Within the Calculator class, the constructor method is defined, which initializes the properties of all the DOM elements that need to be selected. The constructor also provides a method to initialize the calculator display and sets default values for the current and previous operands and operation.
Methods
clear(): clear the calculator display
delete(): delete the last digit from the current operand
appendNumber(number): append a new number to the current operand
chooseOperation(operation): choose an operation
computer(): compute the result of the current operation
getDisplayNumber(number): format a number for display on the calculator
updateDisplay(): update the calculator displayInstance
After creating a new instance of the Calculator class, we add event listeners for each button to update the calculator display based on user input.