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ES6 (ES2015) のMapクラスに関しての注意点

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※ はてなブログから技術ネタを移動しました
※ 初稿:2017-03-17

new Map();

てな感じでマップ使える。

new Map([
  [1, "value"],
  ["2", "valval"],
  [3, "hogehoge"]
]);

みたいな形での初期化はIE11では使えない。
Chrome, Firefox, Safariでは使えるが、互換性を考えると封じておいたほうが良い。

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