Javascript Check if a Key Exists in an Object
Learn how to check in Javascript if a Key Exists in an Object
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Javascript Check if a Key Exists in an Object
When we are working with objects in Javascript, it’s needed to verify the property we are trying to access in available in objects or not. We just need to verify to avoid any critical error.
The best way to identify an object property exist or not is using in
keyword.
The following code is define a car object. Using in keyword we are finding that body and speed properties exist or not. If exist then show the value of these or if not than display the message.
Example
var car = {color:'white', body:"salon"}
if ("color" in car){
console.log(car.color);
}
if ("body" in car){
console.log(car.body);
}
if ("speed" in car){
console.log(car.speed);
}
else{
console.log("Speed is not available")
}