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

The Underscore library in JavaScript provides a set of utility functions that can be used to manipulate arrays, objects, functions, and more. One commonly used function in the Underscore library is the _.defaults(obj, *defaults) function.

The _.defaults(obj, *defaults) function is used to merge the properties of an object with a set of default values. The function takes two parameters: obj and *defaults. The obj parameter is the object to be merged with the default values, and the *defaults parameter is a list of objects containing the default values.

Here is an example of how to use the _.defaults() function in JavaScript:

index.tsx
// Import the Underscore library
const _ = require('underscore');

// Define an object to merge with default values
const myObj = {
  name: 'John',
  age: 30
};

// Define a set of default values
const defaults = {
  name: 'Anonymous',
  gender: 'Unknown',
  email: 'example@example.com'
};

// Merge the object with default values
const mergedObj = _.defaults(myObj, defaults);

console.log(mergedObj);
// Output: { name: 'John', age: 30, gender: 'Unknown', email: 'example@example.com' }
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In this example, the _.defaults() function is used to merge the myObj object with the defaults object. The resulting mergedObj object contains properties from both objects, with values from myObj taking precedence over values from the defaults object. This is why the name property in mergedObj is set to 'John' instead of 'Anonymous'.