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<!DOCTYPE html>
<html>
<body>

<h2>JavaScript Arrays</h2>

<script>
let courses = ['HTML', 'CSS', 'JavaScript', 'MYSQL'];
document.write("<b>" + courses + "</b><br>");
document.write("<b>" + courses.fill('PHP') + "</b>");
</script>

</body>
</html>

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<!DOCTYPE html>
<html>
<body>
​
<h2>JavaScript Arrays</h2>
​
<script>
let courses = ['HTML', 'CSS', 'JavaScript', 'MYSQL'];
document.write("<b>" + courses + "</b><br>");
document.write("<b>" + courses.fill('PHP') + "</b>");
</script>
​
</body>
</html>