A function is a block of code that will be executed when “someone” calls it:
<!DOCTYPE html>
<html>
<head>
<script>
function myFunction()
{
alert(“Hello World!”);
}
</script>
</head>
<body>
<button onclick=“myFunction()”>Try it</button>
</body>
</html>
A function is written as a code block (inside curly { } braces), preceded by the function keyword:
function functionname()
{
some code to be executed
}
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