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sessionStorage.getItem(key)で取得した値につくダブルクオートを剥ぎ取る

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ダブルクオート邪魔ですよね

sessionStorage.getItem(key) // ← ""value""

これは、以下で改善できます。

JSON.parse(sessionStorage.getItem(key)) // ← "value"

JSON.parseの働きが以下だから解決できるわけですね。

JSON.parse('{}');              // {}
JSON.parse('true');            // true
JSON.parse('"foo"');           // "foo"
JSON.parse('[1, 5, "false"]'); // [1, 5, "false"]
JSON.parse('null');            // null

そもそもなぜダブルクオートが付いてしまったのか?

共通化されたメソッドでセッションストレージに保存を行なっていたのですが、
保存するデータは何かわからないため必ずJSON.stringify()を通すようになっていました。

const kuma = JSON.stringify('kuma');
sessionStorage.setItem('hoge', kuma);

sessionStorage.getItem('hoge') // ← ""kuma""

以上です:point_up:

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