JavaScript Programming/Variables and Expressions/Example Code
example.html
edit<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="Cache-Control" content="no-cache">
<title>Example</title>
<script defer src="example.js"></script>
</head>
<body>
<noscript>Enable JavaScript to see web page content.</noscript>
<p>A temperature of <span id="fahrenheit"></span> degrees Fahrenheit is equivalent to
a temperature of <span id="celsius"></span> degrees Celsius.</p>
</body>
</html>
example.js
edit// This program converts a Fahrenheit temperature to Celsius.
//
// References:
// https://www.mathsisfun.com/temperature-conversion.html
// https://en.wikibooks.org/wiki/JavaScript
//
// For more information on on the template literal used in the console.log statements:
// https://en.wikipedia.org/wiki/String_interpolation#JavaScript
"use strict";
debugger;
const TEMPERATURE_DIFFERENCE = 32;
const TEMPERATURE_RATIO = 5 / 9;
let fahrenheit = window.prompt("Enter Fahrenheit temperature:");
console.log(`Input: ${typeof fahrenheit}`);
fahrenheit = Number(fahrenheit);
console.log(`Number: ${typeof fahrenheit}`);
let celsius = (fahrenheit - TEMPERATURE_DIFFERENCE) * TEMPERATURE_RATIO;
console.log(`Calculation: ${typeof celsius}`);
celsius = celsius.toFixed(1);
console.log(`Fixed: ${typeof celsius}`);
document.getElementById("fahrenheit").innerText = fahrenheit;
document.getElementById("celsius").innerText = celsius;