Syntax error How to get key name when the value contains empty in an object with JavaScript?

How to get key name when the value contains empty in an object with JavaScript?

Let’s say the following is our object −

var details = {
   firstName: 'John',
   lastName: '',
   countryName: 'US'
}

Use Object.keys() along with find() to get the key name with empty value. Following is the code −

Example

var details = {
   firstName: 'John',
   lastName: '',
   countryName: 'US'
}
var result = Object.keys(details).find(key=> (details[key] === '' ||
details[key] === null));
console.log("The key is="+result);

To run the above program, you need to use the following command −

node fileName.js.

Output

Here, my file name is demo118.js. This will produce the following output −

PS C:\Users\Amit\JavaScript-code> node demo118.js
The key is=lastName
Updated on: 2020-09-09T13:32:44+05:30

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