how to use the flatmapdeep function from the lodash library in typescript

The flatMapDeep function from the Lodash library can be used to recursively flatten and map an array. In TypeScript, you can use this function by importing it from the Lodash library.

Here's an example of using the flatMapDeep function to flatten and map an array of objects in TypeScript:

index.ts
import { flatMapDeep } from 'lodash';

interface Person {
  name: string;
  skills: string[];
}

const people: Person[] = [
  {
    name: 'Alice',
    skills: ['JavaScript', 'TypeScript', 'React'],
  },
  {
    name: 'Bob',
    skills: ['Java', 'Spring', 'Hibernate'],
  },
];

const flattenedSkills: string[] = flatMapDeep(people, person => person.skills);

console.log(flattenedSkills);
// Output: ["JavaScript", "TypeScript", "React", "Java", "Spring", "Hibernate"]
469 chars
23 lines

In this example, we define an interface for a Person that has a name and skills property. We create an array of Persons and then use the flatMapDeep function to recursively flatten and map the skills property of each Person, resulting in a flattened array of all the skills.

Note that the function passed to flatMapDeep as its second argument must return either an array or a value that can be coerced into an array.