document.getElementsByTagName('div');で取得したHTMLCollectionはそのままだとforEach,map,reduce,filter等の便利な関数は使えないので配列に変換する必要がありますが、ES2015だとすっきり書けます。
const div = document.getElementsByTagName('div');
[...div].forEach((item) => {
// 処理
});
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