Objects

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Basics

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Checking for property Existance

We can check whether a property exists by verifying the value of that particular property aganist undefined datatype

obj = {
	name: "harry",
	age: 33
}

if(obj.hobbies === undefined){
	console.log("There is no hobbies property on object obj")
}

Or use the in keyword to check it.

for(key in obj){
	console.log(key, obj[key])
}

if('hobbies' in obj){
	console.log(obj[hobbies])
}else{
	console.log("there is no hobbies property on object obj")
}

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