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feat: update interaction article.md ru

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### Interaction: alert, prompt, confirm Let the variables be declared as explained before in the previous lessons.

fix: update private-protected-properties-methods article.md en

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### Private and protected properties and methods Let's remove outdated information — private properties and methods are part of the ECMAScript standard✅

### IIFE Let it be more precise — parentheses after `function` are required✅

### Array methods There is no point in trying to change the meaning of the word [_"between"_](https://gramota.ru/meta/mezhdu) with any formulas.

fix: correct substring method in string article.md en

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### Getting a substring The word _"between"_ is not suitable for describing this method - its meaning is precisely: _"to fall between two stools"_. If this mistake was based on...

It should be formulated a little more precisely. There is no "base object", it doesn't matter whether the object is created via the literal notation {} or the new keyword...

### Cross-interview Let it be more precise — keeping consistent writing style✅