cara memeriksa apakah objek memiliki javascript kunci
myObj.hasOwnProperty('key') // it checks object for particular key and not on prototype
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myObj.hasOwnProperty('key') // it checks object for particular key and not on prototype
if ('key' in myObj)
Object.prototype.hasOwnProperty()
Object.prototype.hasOwnProperty.call(object, key)
console.log("key" in obj)