index.html
<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>My JavaScript</title>
</head>
<body>
<script src="main.js"></script>
</body>
</html>main.js
'use strict';
{
const scores = {
math: 80,
english: 90,
};
let sum = 0;
scores.physics = 70;
const entries = Object.entries(scores);
// console.log(entries);
entries.forEach((prop) => {
// console.log(prop);
sum += prop[1];
console.log(`${prop[0]}: ${prop[1]}`);
});
console.log(`Sum: ${sum}`);
console.log(`Average: ${sum / entries.length}`);
}