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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Learning JavaScript</title>
</head>
<body>
<center><h1>Functions</h1></center>
<h3>If we have a piece of code and we want to run lot of time we can put then into the function and use it instead of using again and again. </h3>
<p><strong>JavaScript Function Syntax</strong></p>
<ol>
<li>A JavaScript function is defined with the function keyword, followed by a name, followed by parentheses ().</li>
<li>Function names can contain letters, digits, underscores, and dollar signs (same rules as variables).</li>
<li>The parentheses may include parameter names separated by commas:
(parameter1, parameter2, ...)</li>
<li>he code to be executed, by the function, is placed inside curly brackets: {}</li>
</ol>
<h2>Example:</h2>
<p>function calculateAge(birthYear){<br />
return 2018 - birthYear;<br />
}<br />
<br />
var ageRoopak = calculateAge(1992);<br />
var ageBrooke = calculateAge(1993);<br />
var ageRamesh = calculateAge(1991);<br />
console.log(ageRoopak, ageBrooke, ageRamesh);<br />
function yearUntilRetirement(year, firstName) {<br />
var age = calculateAge(year);<br />
var retirment = 65 - age;<br />
console.log(firstName + ' retires in ' + retirment + 'years.');<br />
}<br />
<br />
yearUntilRetirement(1992, 'Roopak');<br />
yearUntilRetirement(1993, 'Brooke');<br />
yearUntilRetirement(1991, 'Ramesh');</p><br />
<form action="func_result.html">
<input type="submit" name="Check" value="Check">
<p>click 'Check' to see the answer</p>
</form>
</body>
<script src="functions.js"></script>
</html>