how to use the allkeys function from the underscore library in javascript

The _.allKeys() function from the Underscore library can be used in Javascript to retrieve all the keys of an object, including its inherited properties. Here's an example of how to use it:

index.tsx
var _ = require('underscore');

var person = {
  name: 'John',
  age: 30,
  gender: 'male'
};

// Add properties to the person object
person.country = 'USA';
person.city = 'New York';

// Retrieve all the keys of the person object, including inherited properties
var keys = _.allKeys(person);

console.log(keys); // ['name', 'age', 'gender', 'country', 'city']
361 chars
17 lines

In this example, we first import the Underscore library using the require() method. We then create an object called person with some properties. We then add two more properties to the person object.

Finally, we use the _.allKeys() function to retrieve all the keys of the person object, including its inherited properties. The function returns an array of strings with all the keys, which we log to the console using the console.log() method.