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In JavaScript, is it a good practice to put all declarations at the top?
- 王林forward
- 2023-09-07 23:01:021087browse
Yes, it is a good practice to put all 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 valid reasons -
- Provide a place to check all variables.
- Helps avoid global variables li>
- Avoid redeclaration.
- The code is also easy for others to read.
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