#author("2020-05-27T18:58:39+09:00","default:ryuichi","ryuichi")
* オブジェクトが空か調べる [#p435645d]

 // because Object.keys(new Date()).length === 0;
 // we have to do some additional check
 Object.keys(obj).length === 0 && obj.constructor === Object

** 参考 [#q5542a26]

- https://coderwall.com/p/_g3x9q/how-to-check-if-javascript-object-is-empty
- https://stackoverflow.com/questions/679915/how-do-i-test-for-an-empty-javascript-object


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