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![JavaScript の parseInt で小数を整数に変換しようとしてはまる](https://cdn-ak-scissors.b.st-hatena.com/image/square/1ef26f6cb4349557952890dbe3e567f7f98dc151/height=288;version=1;width=512/https%3A%2F%2Fgithub.githubassets.com%2Fassets%2Fgist-og-image-54fd7dc0713e.png)
In ECMAScript 6, the object Symbol has several properties that contain so-called well-known symbols (Symbol.iterator, Symbol.hasInstance, etc.). These let you customize how ES6 treats objects. This blog post explains the details. Warning # Implementation of the features described here is work in progress. Consult the “ECMAScript 6 compatibility table” for what is supported where (spoiler: not muc
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