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3 changes: 3 additions & 0 deletions 1-js/02-first-steps/15-function-basics/article.md
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Expand Up @@ -523,6 +523,9 @@ function name(parameters, delimited, by, comma) {
```

- Values passed to a function as parameters are copied to its local variables.
- If a function is called, but an argument is not provided, then the value of the respective parameter becomes undefined.
- To assign such parameter a default value instead, specify it using "=" in the parameter list during function declaration.
- Any expression can be used as a default value for a parameter — including function calls.
- A function may access outer variables. But it works only from inside out. The code outside of the function doesn't see its local variables.
- A function can return a value. If it doesn't, then its result is `undefined`.

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