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Ilya Kantor 2020-08-09 21:01:59 +03:00
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# Variable scope
JavaScript is a very function-oriented language. It gives us a lot of freedom. A function can be created dynamically, passed as an argument to another function and called from a totally different place of code later.
JavaScript is a very function-oriented language. It gives us a lot of freedom. A function can be created at any moment, passed as an argument to another function, and then called from a totally different place of code later.
We already know that a function can access variables outside of it.
Now let's expand our knowledge to include more complex scenarios.
But what happens if these "outer" variables change since a function is created? Will the function see newer values the old ones?
And if a function is passed along as a parameter and called from another place of code, will it get access to outer variables at the new place?
Let's expand our knowledge to understand these scenarios and more complex ones.
```smart header="We'll talk about `let/const` variables here"
In JavaScript, there are 3 ways to declare a variable: `let`, `const` (the modern ones), and `var` (the remnant of the past).