JSFiddle - React, Tailwind, and code Playground

JavaScript

//Update display on keydown event
addEventListener('keydown', (e) => {
    pressedKey = event.key;
    console.log(pressedKey);
    keyDownOperatorMapping(e);
});

let keyDownOperatorMapping = (e) => {
if (pressedKey === "+" || "-" || "*" || "Enter" || "Backspace" || "." || "/") {
masterFunction(e);
} 
};