In a function component, update the React state that the UI uses with a useState setter or useReducer dispatch. If the value lives outside React, subscribe to it with useSyncExternalStore. Class components also provide this.forceUpdate(), but it is an uncommon escape hatch—not the usual fix for stale UI.
Choose the update mechanism that matches where the data lives
React normally renders a component from its current props, state, and context. A parent changing props or a provider changing a context value can prompt a render too. When the screen is stale, trace the displayed value to its source and make changes to that source visible to React; an unrelated “force render” counter can hide the real problem.
| Situation | Use | What it does |
|---|---|---|
| Local UI value in a function component | useState setter or useReducer dispatch |
Updates React state and schedules rendering when the next state differs. |
| Data in a mutable external store | useSyncExternalStore |
Subscribes the component to changes and reads a snapshot. |
| Exceptional imperative update in a class component | this.forceUpdate() |
Requests a render without checking shouldComponentUpdate. |
| Need to read the DOM immediately after an update | flushSync, only when necessary |
Controls update timing; it does not make React detect a mutation. |
Trigger an update in a function component
Call the setter returned by useState with the next value. If the new value depends on the previous one, use the functional form:
import { useState } from 'react';
function Counter() {
const [count, setCount] = useState(0);
function increment() {
setCount(previousCount => previousCount + 1);
}
return <button onClick={increment}>Count: {count}</button>;
}For state managed by useReducer, dispatch an action and ensure the reducer returns the state that the component should render. React can skip an update when the next state is Object.is-equal to the current state, so mutate neither an object nor an array in place and then return the same reference. Instead, create a new state value. See the official useState reference.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
Subscribe to an external store
A value held in a mutable store or browser API does not become React state merely because a component reads it. Use useSyncExternalStore to connect the component to that source:
const snapshot = useSyncExternalStore(
store.subscribe,
store.getSnapshot
);The store’s subscribe function should register a callback and return a cleanup function. When the store changes, it notifies subscribers; React calls getSnapshot to read the current value. The snapshot should be immutable and remain stable while the underlying store is unchanged. Return a different, immutable or cached snapshot when relevant data changes. The useSyncExternalStore reference explains the subscription and snapshot requirements.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Use forceUpdate only for an exceptional class-component case
Class components have this.forceUpdate(). React documents it as a way to “force a component to re-render,” and it bypasses the class’s shouldComponentUpdate method. React advises against using it when rendering can follow from changed props, state, or context. If the class UI is stale, first find out why the relevant data is not being updated through those normal paths. For external-store data in a function component, use useSyncExternalStore. See React’s Component API reference.
Do not use refs or Effects as render triggers
Changing a ref does not schedule a render. Refs are appropriate for mutable values that do not need to affect the rendered UI; if a changing value must appear on screen, put it in state or expose it through an external-store subscription.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
useEffect is for synchronizing with external systems after rendering, not for making React notice a value that changed outside its state model. Likewise, useMemo caches a calculation; it is not an update trigger. Keep rendering pure: do not mutate globals, subscribe, or perform other side effects in the render body. React may run or discard render work, and Strict Mode may call render more than once in development. Follow React’s components and Hooks purity guidance.
Check why the UI is not updating
- Identify whether the displayed value comes from local state, props, context, or an external store.
- Confirm the setter or dispatch runs and that the rendered expression reads the updated value.
- For object or array state, create a new value instead of mutating the existing one and reusing its reference.
- For a store subscription, check that its callback is notified and that its snapshot is stable while unchanged and changes when the relevant data changes.
- If a component or parent uses
memo, inspect the props that actually changed.memois a performance optimization that may skip rendering when props are unchanged, not an update mechanism. See the memo reference. - In a class component, inspect whether
shouldComponentUpdatereturnsfalse; reserveforceUpdatefor cases where bypassing it is truly intended. - Move subscriptions and other side effects out of render and into the appropriate subscription setup or Effect.
When you need the DOM immediately
Most updates should be left to React’s normal scheduling. If a rare case requires the DOM to reflect an update before code reads it, React’s useState reference points to flushSync as a timing option. It is not a general-purpose way to force React to notice an external mutation; wire that data into state or a subscription instead. See the useState reference.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
useSyncExternalStore was introduced in the React 18 release announcement dated March 29, 2022. That history does not establish which React version a particular project currently has installed; check the project’s own dependency and integration requirements. See React v18.0.
Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
