Delve into TypeScript generics and learn to build reusable functions and React components for searching, sorting, and filtering data, enhancing both business logic and UI efficiency.

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lesson-3

TypeScript’s generics are a powerful tool that enables developers to ensure their code is flexible and reusable. Using generics can help developers manage exactly what types are used in functions and components around the application.

In this course, we’ll first get an overview of TypeScript generics and create generic search and sort functions. Next, we’ll create a React component for searching that would leverage our generic search function. Then, we’ll create a generic function and a React component for sorting and filtering, respectively. Finally, we’ll bring all these functionalities together to create one component that can manage searching, sorting, and filtering of any data passed to it.

By the end of this course, you'll know how to write generic TypeScript functions and craft React components that use TypeScript generics. You’ll also be able to deploy concise solutions in both business logic and user interface senses for searching, sorting, and filtering data on client side in applications.

Building User Interfaces and Functions with TypeScript and React

Although we have built out our full UI for searching and sorting, there’s no way to specify if we want our sorters to show data in ascending or descending order.

To fix this, let’s return to our `genericSort()` function. We can add an additional parameter to this function, called `isDescending`.


export default function genericSort<T>(a: T, b: T, property: keyof T, isDescending: boolean) {
  if (a[property] > b[property]) {
    return 1;
  }
  if (a[property] < b[property]) {
    return -1;
  }
  return 0;
}

# Refactoring `genericSort()` to handle the sorting direction

To reverse the sorting order, we could check the `isDescending` flag at each point of return in our `genericSort()` function, flipping the `1` and `-1` signs. But, instead of doing this at each of the return statements, we can be a bit creative, write less code, and make it easier to understand. First, we’ll wrap what we currently have in `genericSort()` in a new function called `result`.


Add the ability to sort in ascending or descending order with the generic sort function and a React component.


Adding Descending Functionality to Sort

Add the ability to sort in ascending or descending order with the generic sort function and a React component.

Introduction

TypeScript Generics Introduction

Creating Mock Data for the Application

Building a Generic Search Function and UI Component

Building a Generic Sort Function and UI Component

Building a Generic Filter Function and UI Component

Generics in TypeScript

Organizing Everything into a Single Generic Component

Create a Content Management System (CMS)

Course Review and Final Comments

Appendix

Adding Descending Functionality to Sort

Refactoring `genericSort()` to handle the sorting direction

Generics in TypeScript

Create a Content Management System (CMS)

Adding Descending Functionality to Sort

Refactoring genericSort() to handle the sorting direction

Refactoring `genericSort()` to handle the sorting direction