nodejs need use 'strict use'?or what is the best practice of node's strict mode?

Question

I'm a new to node.js and javascript.I checked code examples of node.js and it used use strict mode.

For example, a server.js:

'use strict';
//some server code

Also, I got to know that use strict is present at head of every js file. It confused me and so I want to know what is best practice in Nodejs to use strict mode?

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Thank you all, My question is focus on the strict mode. In this mode, some code mistake can be reported. In back-end, the strict error reporter also run? And If I need use it, I should add it in every js file header? Or add it in main file(server.js or etc.) head? Or use some node.js self style?

Answer 1

Use it always. If nothing else, it ensures that your code is properly written, and cross browser compatible as it can be. It also will reveal mundane syntax errors that would otherwise go unfound, and lead to hours of unnecessary debugging.

Answer 2

“use strict” is a behavior flag you can add to to first line of any JavaScript file or function. It causes errors when certain bad practices are use in your code, and disallows the use of certain functions, such as with.

References:

1. Restrictions on Code in Strict Mode by Microsoft MSDN
2. Node.js Best Practices