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

The defaults function is a utility function from the Underscore.js library that is used to set default values to an object. This function is useful when you want to provide default values to an object if no value is provided for a particular property.

Here's an example of using the defaults function:

index.tsx
// Load the underscore library (assuming it is already installed)
const _ = require('underscore');

// Create an object with some properties
const myObject = {
  name: 'John Doe',
  age: 35
};

// Set default values for some properties
const defaults = {
  age: 18,
  gender: 'unknown'
};

// Use the defaults function to merge the object with the default values
const result = _.defaults(myObject, defaults);

// Output the result
console.log(result); // { name: 'John Doe', age: 35, gender: 'unknown' }
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In this example, we have an object myObject that has two properties: name and age. We also have an object defaults that has default values for the age and gender properties.

We use the defaults function from the Underscore.js library to merge these two objects, with the default values overriding any properties that are not set in the myObject object.

The resulting object result has all three properties (name, age, and gender) with the values from myObject, but with the age property overridden by the default value of 18, and the gender property set to the default value of 'unknown'.