The Strict Mode in JavaScript

🧑‍🏫 Let's talk about the JavaScript strict mode. 🧑‍🎓

Basically, the strict mode allows you to place a JavaScript script in a strict operating context.

Some JavaScript silent errors will be throw out in this mode.

Here are the most common changes if the strict mode applied.

1. Variables must be declared first.

2. Can't delete variables or functions.

3. Duplicate Parameter Names are not allowed.

4. Can't use numbers with a leading 0 to represent octal values.

5. Can't use reserved words as variable names.

6. In some cases, this becomes undefined.

7. Function arguments can't be modified.

If you're always following the best practise, this strict mode shouldn't have big impact on your coding.

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