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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.
Updated on 20-May-2020 09:07:11
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