en.javascript.info/1-js/4-data-structures/4-object/2-is-empty/task.md

importance: 5

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Check for emptiness

Write the function isEmpty(obj) which returns true if the object has no properties, false otherwise.

Should work like that:

let schedule = {};

alert( isEmpty(schedule) ); // true

schedule["8:30"] = "get up";

alert( isEmpty(schedule) ); // false