Check for emptiness
importance: 5
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) ); // falseJust loop over the object and return false immediately if there’s at least one property.
function isEmpty(obj) { for (let key in obj) { // if the loop has started, there is a property return false; } return true; }