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@ -8,7 +8,7 @@ For instance:
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- `Object.assign(dest, src1, ..., srcN)` -- copies properties from `src1..N` into `dest`.
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- ...and so on.
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In this chapter we'll learn how to do the same. And, more importantly, how to feel comfortable working with such functions and arrays.
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In this chapter we'll learn how to do the same. And also, how to pass arrays to such functions as parameters.
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## Rest parameters `...`
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@ -96,9 +96,7 @@ showName("Julius", "Caesar");
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showName("Ilya");
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```
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In old times, rest parameters did not exist in the language, and using `arguments` was the only way to get all arguments of the function, no matter their total number.
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And it still works, we can use it today.
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In old times, rest parameters did not exist in the language, and using `arguments` was the only way to get all arguments of the function. And it still works, we can find it in the old code.
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But the downside is that although `arguments` is both array-like and iterable, it's not an array. It does not support array methods, so we can't call `arguments.map(...)` for example.
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@ -119,9 +117,10 @@ function f() {
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f(1); // 1
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```
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````
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As we remember, arrow functions don't have their own `this`. Now we know they don't have the special `arguments` object either.
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````
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## Spread operator [#spread-operator]
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