JavaScript - Web development basic Series: Building a Basic Calculator App

Published: 19 August 2026
on channel: Web Development Tutorials

A real calculator genuinely needs to read two numbers and an operator, then compute the actual result. In this video you'll build real calculator logic.

Code walkthrough (javascript):
function calculate(a, op, b) {
if (op === '+') return a + b;
if (op === '-') return a - b;
if (op === '*') return a * b;
if (op === '/') return a / b;
throw new Error('Unknown operator');
}
const result = calculate(12, '*', 4);
document.getElementById('result').textContent = result;

What it looks like: ❌ 0 — the real calculator's starting display → ✅ 48 — the real, genuinely computed result of 12 * 4

Try it yourself: Add a real modulo (%) operator branch to the calculate function.

#javascript #js #webdev #coding #programming #tutorial

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