Is their JavaScript “not in” operator for checking object properties?

To get only the else part, just negate, using ! the operator in JavaScript. You can try to run the following code to achieve this −

var arr = {};
if (!(id in arr)) {
}
else {
}

In addition, if you want the existence of a property in an object, then use hasOwnProperty −

if (!arr.hasOwnProperty(id)) {
}
else {
}

Vrundesha Joshi

Updated on: 23-Jun-2020

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