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update description regarding forEach method on Set

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Violet.Lee 2019-06-09 00:18:24 +09:00 • committed by Violet Bora Lee
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1-js/05-data-types/07-map-set-weakmap-weakset/article.md
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@ -222,9 +222,9 @@ set.forEach((value, valueAgain, set) => {
});
```
Note the funny thing. The `forEach` function in the `Set` has 3 arguments: a value, then *again a value*, and then the target object. Indeed, the same value appears in the arguments twice.
Note the funny thing. The callback function passed in `forEach` has 3 arguments: a value, then *again a value*, and then the target object. Indeed, the same value appears in the arguments twice.
That's for compatibility with `Map` where `forEach` has three arguments. Looks a bit strange, for sure. But may help to replace `Map` with `Set` in certain cases with ease, and vice versa.
That's for compatibility with `Map` where the callback passed `forEach` has three arguments. Looks a bit strange, for sure. But may help to replace `Map` with `Set` in certain cases with ease, and vice versa.
The same methods `Map` has for iterators are also supported: