Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteTo sort Dart objects by an expensive-to-compute value, compute that value once per item, sort key–item pairs, then extract the items. This Schwartzian transform (also called decorate-sort-undecorate) can avoid repeating key extraction inside a comparator, but it is not automatically faster: temporary storage and allocation add costs that depend on the workload.
How the Schwartzian transform works
A sorting comparator may be called many times. If it parses, normalizes, or traverses nested data on each call, the same key can be derived repeatedly. The transform separates that work from sorting:
- Decorate each item with its computed key and, if needed, its original position.
- Sort the decorated entries by key.
- Undecorate by returning the original items in sorted order.
Implement it for a Dart list
This version accepts a List<T>, computes each key once, and preserves input order when keys compare equal by using the original index as a tie-breaker.
List<T> sortedByKey<T, K extends Comparable<K>>(
List<T> items,
K Function(T) keyOf,
) {
final decorated = [
for (var i = 0; i < items.length; i++)
(key: keyOf(items[i]), index: i, value: items[i]),
];
decorated.sort((a, b) {
final byKey = a.key.compareTo(b.key);
return byKey != 0 ? byKey : a.index.compareTo(b.index);
});
return [for (final entry in decorated) entry.value];
}For example, if Person has a costly normalizedName getter, call the helper with people and (person) => person.normalizedName. The helper returns a new sorted list; it does not reorder the input list.
#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.
The generic bound requires K to implement Comparable<K>. Dart documents Comparable for a type’s intrinsic ordering; when the same type has multiple useful orderings, use explicit comparators that express the intended order (Dart core libraries; Comparable API).
For a general iterable
The indexed implementation assumes a list with length and indexed access. For a general Iterable<T>, materialize it once and then decorate in a single pass:
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.
final input = items.toList();
final decorated = [
for (var i = 0; i < input.length; i++)
(key: keyOf(input[i]), index: i, value: input[i]),
];Sort and extract the entries as in the list implementation. The materialization is an additional allocation to account for when comparing approaches.
How to sort without preserving equal-key order
If source order among equal keys does not matter, omit the index and compare only keys:
Quick wins for a faster PC:
Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →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.
final decorated = items
.map((item) => (key: expensiveKey(item), item: item))
.toList();
decorated.sort((a, b) => a.key.compareTo(b.key));
final sortedItems = decorated.map((entry) => entry.item).toList();Dart’s List.sort is not guaranteed to be stable: distinct objects that compare as equal may occur in any order in the result (Dart ListBase sort API). The index tie-breaker in the first example makes equal-key entries sort by their input positions, so their relative order is retained.
Make the key comparison match the intended order
A comparator returns a negative integer when its first argument sorts before the second, zero when they compare equal, and a positive integer when the first sorts after the second. It must consistently express the ordering you intend (Dart ListBase sort API).
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
- Descending order: reverse the key comparison deliberately rather than changing the key’s meaning.
- Nullable keys: decide explicitly whether null sorts first, last, or another way; the example’s non-null
Comparablebound does not define that policy. - Strings: use the comparison semantics your application requires, such as locale-aware ordering when appropriate; ordinary
compareToshould not be assumed to provide it. - Composite keys: compare fields in priority order, moving to the next field when the previous comparison is zero.
Is precomputing sort keys faster than a Dart comparator?
It can be a candidate when deriving each key is expensive and would otherwise recur across comparator calls. It also adds a decorated list or records, temporary memory use, and a pass to extract the sorted values. When key extraction is cheap, direct sorting may be simpler and may avoid that overhead. The outcome depends on key cost, input size and shape, allocation pressure, and the Dart runtime.
No Dart-specific comparative benchmark or measured speedup is established here. The secondary article published by iTechGuides Team on 2026-10-03 likewise does not establish that either approach is categorically faster (Dart Sorting: Schwartzian Transform vs Comparator Performance). Benchmark both implementations with representative inputs on the SDK and runtime that matter to your application. Keep the key calculation, input sizes, and allocation conditions representative; do not infer a general speedup from a single workload.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
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.
Choose the approach for your workload
| Consideration | Direct comparator sorting | Schwartzian transform |
|---|---|---|
| Key derivation cost | Suitable when deriving the key is cheap. | Worth evaluating when derivation is expensive and repeated comparisons would redo it. |
| Temporary storage | Does not require a decorated list. | Requires temporary decorated entries and a result extraction step. |
| Equal-key order | Dart sort is not guaranteed stable; add an index tie-breaker if source order matters. | Likewise requires an index tie-breaker to preserve source order. |
| Performance outcome | Measure on the target SDK and runtime; no categorical winner is established. | Measure on the target SDK and runtime; no Dart-specific fixed speedup is established. |
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.
