#data-fetching code explainers

javascript

import { useEffect, useRef, useState } from 'react';
 
export function useDelayedFlag(active, delay = 300) {
  const [visible, setVisible] = useState(false);

Delaying a loading spinner with a React hook

custom-hooks debouncing cleanup

Intermediate 8 steps

javascript

import { cache } from 'react'
import { notFound } from 'next/navigation'
import { db } from '@/lib/db'

Deduping data fetches with React cache in Next.js

request-memoization data-fetching server-components

Intermediate 6 steps

javascript

import { useReducer, useEffect } from "react";
 
const initialState = { status: "idle", data: null, error: null };

Building a data-fetching hook in React

custom-hooks usereducer data-fetching

Intermediate 9 steps

javascript

import { Suspense } from 'react';
import { getProducts } from '@/lib/api/products';
import { formatPrice } from '@/lib/format';

Streaming a product list with Suspense in Next.js

server-components suspense streaming

Intermediate 8 steps

javascript

import { useState, useEffect, useMemo } from 'react';
 
function useDebounce(value, delay = 300) {
  const [debounced, setDebounced] = useState(value);

Debounced search with cancellation in React

custom-hooks debounce abortcontroller

Intermediate 9 steps

javascript

import { useState, useEffect } from "react";
 
export function useUser(userId) {
  const [user, setUser] = useState(null);

How a data-fetching hook works in React

custom-hooks data-fetching abortcontroller

Intermediate 8 steps