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Ilya Kantor 2019-08-17 20:28:00 +03:00
parent 28a514a0d7
commit cdf6156088
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1-js/02-first-steps/12-while-for/article.md
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@ -309,8 +309,7 @@ for (let i = 0; i < 3; i++) {
let input = prompt(`Value at coords (${i},${j})`, '');
// what if I want to exit from here to Done (below)?
// what if we want to exit from here to Done (below)?
}
}

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1-js/04-object-basics/03-symbol/article.md
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By specification, object property keys may be either of string type, or of symbol type. Not numbers, not booleans, only strings or symbols, these two types.
Till now we've only seen strings. Now let's see the advantages that symbols can give us.
Till now we've been using only strings. Now let's see the benefits that symbols can give us.
## Symbols
"Symbol" value represents a unique identifier.
A "symbol" represents a unique identifier.
A value of this type can be created using `Symbol()`:

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1-js/09-classes/07-mixins/article.md
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In JavaScript we can only inherit from a single object. There can be only one `[[Prototype]]` for an object. And a class may extend only one other class.
But sometimes that feels limiting. For instance, I have a class `StreetSweeper` and a class `Bicycle`, and want to make their mix: a `StreetSweepingBicycle`.
But sometimes that feels limiting. For instance, we have a class `StreetSweeper` and a class `Bicycle`, and want to make their mix: a `StreetSweepingBicycle`.
Or we have a class `User` and a class `EventEmitter` that implements event generation, and we'd like to add the functionality of `EventEmitter` to `User`, so that our users can emit events.
There's a concept that can help here, called "mixins".
As defined in Wikipedia, a [mixin](https://en.wikipedia.org/wiki/Mixin) is a class that contains methods for use by other classes without having to be the parent class of those other classes.
As defined in Wikipedia, a [mixin](https://en.wikipedia.org/wiki/Mixin) is a class containing methods that can be used by other classes without a need to inherit from it.
In other words, a *mixin* provides methods that implement a certain behavior, but we do not use it alone, we use it to add the behavior to other classes.