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

To use the assign function from the underscore library in TypeScript, you need to install Underscore.js as a dependency first. You can do this by running npm install underscore in your project's directory.

Once you have Underscore.js installed, you can import it like this:

index.ts
import * as _ from 'underscore';
33 chars
2 lines

Then you can use the assign function like this:

index.ts
const obj1 = {a: 1};
const obj2 = {b: 2};
const obj3 = {c: 3};

const result = _.assign({}, obj1, obj2, obj3);

console.log(result); // Output: {a: 1, b: 2, c: 3}
163 chars
8 lines

In the code above, we imported the entire Underscore.js library using the import * as syntax, this is because in TypeScript you cannot import the default export of a module that does not declare one. We then passed an empty object as the first argument to the assign function to prevent the original objects from being modified. Finally, we passed the objects to merge as parameters to the assign function. The result is a new object that contains the properties of all the passed objects.