🏗️Project: the Calculator

Your first real app! Two inputs, four operations, one display — exactly the pattern of every interface: read, compute, display.

Tip: write a compute(operator) function and wire every button to it, like in the previous level.

function compute(op) {
  var a = Number(document.getElementById('a').value);
  var b = Number(document.getElementById('b').value);
  if (op === '+') { ... }
}