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【JavaScript】複数の数値が定義されている配列dataから「各数値」と「40未満の数値がいくつあるか」を表示する

Posted at
<!DOCTYPE html>
<html lang="ja">
<head>
    <meta charset="UTF-8">
    <title>40点未満の人を割り出す</title>
    <script>
        var count=0; 
        var data = [59, 39, 100, 2, 15, 40, 84, 97, 39, 41, 39.9, 40.1];
        for(var i = 0;i<data.length;i++) {
            document.write(data[i]+'<br>'); // 配列データの表示
            if(data[i]<40){
              count++;
            }
        }
        document.write('<h1>40点未満の人は' + count + '人です</h1>'); // 40未満の数値の個数表示
    </script>
</head>
<body>
</body>
</html>

image.png

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