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

To use the defaults function from the underscore library in TypeScript, you can simply import it from the library as shown below:

index.ts
import { defaults } from 'underscore';
39 chars
2 lines

The defaults function takes two or more objects as arguments and returns a new object that merges the properties of all the objects. If two or more objects have the same property, the value of the property in the last object will override the previous values. Here is an example that demonstrates how to use the defaults function:

index.ts
const options = { name: 'John', age: 30 };
const defaults = { name: 'Anonymous', city: 'Unknown' };
const config = defaults(options, defaults);
console.log(config); // { name: 'John', age: 30, city: 'Unknown' }
211 chars
5 lines

In the example above, the options object has the properties name and age, while the defaults object has the properties name and city. The defaults function is called with the options and defaults objects as arguments, and returns a new object that merges the properties of both objects. The name property in the options object has a higher precedence than the name property in the defaults object, so its value is used in the resulting object. The resulting object has the properties name, age, and city.