Is it a good practice to place all declarations at the top in JavaScript?
Yes, it is a good practice to place all the JavaScript declarations at the top. Let’s see an example:
Example
<html>
<head>
<title>JavaScript String match() Method</title>
</head>
<body>
<script>
// all the variables declared at top
var str, re, found;
str = "For more information, see Chapter 3.4.5.1";
re = /(chapter \d+(\.\d)*)/i;
found = str.match( re );
document.write(found );
</script>
</body>
</html>
The following are the valid reasons:
- Gives a single place to check for all the variables.
- Helps in avoiding global variables
- Re-declarations are avoided.
- The code is easy to read for others as well.
Published on 26-Feb-2018 09:40:18
