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Showing content from https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/Map/entries below:

Map.prototype.entries() - JavaScript | MDN

Baseline Widely available

entries() は Map インスタンスのメソッドで、挿入順でこの Map オブジェクトのそれぞれの要素に対する [key, value] のペアを含む新しいイテレーターオブジェクトを返します。

const map1 = new Map();

map1.set("0", "foo");
map1.set(1, "bar");

const iterator1 = map1.entries();

console.log(iterator1.next().value);
// Expected output: Array ["0", "foo"]

console.log(iterator1.next().value);
// Expected output: Array [1, "bar"]

なし。

新しい反復可能なイテレーターオブジェクトです。

const myMap = new Map();
myMap.set("0", "foo");
myMap.set(1, "bar");
myMap.set({}, "baz");

const mapIter = myMap.entries();

console.log(mapIter.next().value); // ["0", "foo"]
console.log(mapIter.next().value); // [1, "bar"]
console.log(mapIter.next().value); // [Object, "baz"]

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