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Finding It Challenging to Maintain Software Created with Coding Agents?
What is different though are thatSince we are not spending 6-8 hours a day working with the code base unlike pre-coding agents, we lack the indepth knowledge and intuition that helps us narrow down root cause when bugs arise, or know how to best extend the current code base to support a new featureBecause of the productivity from coding agents, the size of the code base and sophistication of the app relative to number of developers has also increased. Each developer now needs to maintain context
Show HN: Write SaaS apps where users control where their data is stored
So I've started a quest to understand how it works and I begun to implement an alternative to Google Docs.I was convinced that this kind of real time collaboration is the future so I've given it much thought how I could make this as generic as possible so I could use it in all future tools I would build.In the same time I was playing around with firebase (surprisingly you can not build a google docs alternative with firebase that easy as their real time collaboration does not provide m
Show HN: FPGA design acceleration – idiomatic Python to synthesizable Verilog
Recently I've been working on a certain embedded system that has an FPGA running EKF and some controls. Coding that in RTL is inefficient at best so I turned to HLS and looked around to see what the industry has to offer. I have a pretty extensive simulation and verification scaffold in Python, so ideally I wanted something that can accept Python directly, preferably with minimal adaptation, so that I could feed relevant parts of my Python models to the HLS tool and immediately get a working RTL out. Also I wanted floating point. I should add that my FPGA here is Lattice ECP5 which means that Vitis et al are not an option, so I was focusing on vendor-agnostic tools. There are some that can ingest Python but they are frankly not really usable in practice aside from perhaps a very narrow set of applications -- I evaluated Polyphony, PyLog, Allo+XLS, Allo+Vitis (not really an option because Lattice), and Veriloggen. They work in the sense that they translate some Python into some RTL, but not in the sense that you can get something immediately useful out of them if you're trying to build, say, a Kalman filter or even a basic PID controller. Then there are highly capable tools like the aforementioned XLS, Bambu, etc. that unfortunately don't support Python and there are a few shortcomings (especially when it comes to ECP5) that I will cover someday in a later post.<p>So, behold Holoso: <a href="https://github.com/Zubax/holoso" rel="nofollow">https://github.com/Zubax/holoso</a><p>To me personally this is a big deal because it has already enabled dramatic acceleration of my work. The feature set is currently mostly defined by my immediate needs but it is extensible and contributions are welcome.<p>I will spare a detailed explanation of how it works (follow the link for that) but the basic idea is that it parses Python, constructs a CFG, identifies which operators are needed, constructs a minimal specialized VLIW core, schedules microcode (fully statically to keep the core simple), and emits Verilog along with some extra outputs like Cocotb and reports. There are examples included that will give you a better feel of what it's like; there are even some exotic ones like UART rx/tx, which I would not call a sensible use of this tool but it's mostly there to outline its limits more clearly -- it's an HLS, not an RTL, so keep that in mind.<p>I have already benchmarked it side by side with Bambu, XLS, Dynamatic, and Vitis, and the results seem decent; I am going to post about this later if there's interest (still working on this).<p>Holoso is available under Apache-2 with explicit legal waivers for generated RTL.<p>Hopefully someone will find it useful as well!
Show HN: Pure Effect – Reproduce production bugs on your laptop without a DB
Hi HN,<p>I think it's safe to say that the majority of developers don't give a second thought to writing code with I/O tangled in business logic. It's all too common to see code like: const user = findUser(email); if (!user) await saveUser(user);<p>Now, you may ask: what's the big deal? When we write code like this, two things happen:<p>1. It gets harder to debug production bugs. Unless you have the exact same database and remote API services to connect to, you may fail to reproduce the bug.<p>2. You have to use mocks and fakes in your tests, or use test containers, which only help somewhat, and they are slow!<p>To solve these issues, I built Pure Effect, a tiny TypeScript/JavaScript effect library. The core idea is simple: if a function performs I/O, it isn't pure. But if it returns a description of the I/O it wants to perform, it is. So instead of await findUser(email), you return a Command object that says, "I would like to call this function, and when it finishes, here's what to do next." Your business logic becomes a pure function. Same input, same output, every time. The database never gets touched until the interpreter (runEffect) runs.<p>When I first started the library, I didn't expect just how far that one idea would stretch. Once your pipelines are just data, a lot of wonderful things become possible:<p>- No need for mocking libraries. You walk the tree in tests and assert on its structure: assert.equal(flow.cmd.name, 'cmdFindUser'). Nothing is executed.<p>- Wrap any effect with Retry(effect, { attempts: 3, delay: 200, backoff: 2 }). The configuration is plain data, so you can assert on it in tests.<p>- Every command's input and output flows through the interpreter, so you get a full execution trace for free. You can write a simple timeTravel() function that replays it locally without touching any I/O. Perfect for debugging complex production bugs.<p>- An onBeforeCommand hook sits between your business logic and the interpreter. Since it sees every intended side effect before it fires, it can be used to enforce runtime guardrails. You can quarantine destructive calls before they happen for example.<p>- You can review AI-generated code before it runs. Since Pure Effect pipelines are plain data, you can inspect what the generated code intends to do before it touches anything.<p>There are just six primitives: Success, Failure, Command, Ask, Retry, and Parallel, plus effectPipe and runEffect. Zero dependencies. Under 1 KB minified and gzipped.<p>How it compares to Effect-TS<p>Effect-TS is the full-featured option in this space and has a large ecosystem. Pure Effect offers a different tradeoff. It covers the 80% case: testable pipelines, dependency injection, retry, and OpenTelemetry hooks, all in under 1 KB with zero dependencies and no new vocabulary to learn. Effect-TS is a framework you build around. Pure Effect, on the other hand, is a pattern you drop into existing code.<p>I've been using Pure Effect in production since December. It's at v0.8.0, not 1.0 yet, but stable enough that I wanted to put it out there and hear what people think.<p>GitHub: <a href="https://github.com/aycangulez/pure-effect" rel="nofollow">https://github.com/aycangulez/pure-effect</a><p>I wrote five posts that document how Pure Effect evolved. They are tagged at <a href="https://lackofimagination.org/tags/effect/" rel="nofollow">https://lackofimagination.org/tags/effect/</a> if you want the longer story.
The best Prime Day deals on DJI creator tools — we found last-chance deals on mics, drones, and cameras
Some of our favorite DJI products are still on sale.
We found 15+ Prime Day headphones deals still available at Amazon: Shop Bose, Sony, and Marshall
Prime Day ends tonight. Here are the best headphone and earbud deals you can still buy, plus where to find the AirPods Max 2 in stock.
These are the best deals you can still get on MacBooks before Apple’s price hike kicks in
Apple just announced steep price increases to all MacBooks, Mac desktops, and iPads due to memory shortages. Here are the Mac deals (including Prime Day deals) you can still get.
Henckels Definition 15-Piece Knife Block Set for $46 + free shipping
Use promo code "SUNSHINE20" to get the Henckels Definition 15-Piece Knife Block Set for $46. It's $17 less than our mention from last week and the best price we could find by $52. The knives are precision-stamped from high-carbon stainless steel. Coupon ends July 1. Buy Now at eBay
Open-Box Hyper Tough 1800PSI Electric Pressure Washer for $41 + free shipping
<img src='https://d.dlnws.com/64599/1782640449-product-trimmed.jpg?h=107&w=125' style='float: left;vertical-align: top;margin: 0 8px 8px 0'><div class="snippet summary" title="Stack promo codes "VIPJUNETAKE8" and "SUNSHINE20" at checkout to bring this open-box Hyper Tough 1800PSI pressure washer down to $41. It's the best price we could find by $67. Shipping is free. Coupon expires July 1."><p>Stack promo codes "VIPJUNETAKE8" and "SUNSHINE20" at checkout to bring this open-box Hyper Tough 1800PSI pressure washer down to $41. It's the best price we could find by $67. Shipping is free. Coupon expires July 1. Buy Now at eBay</p></div> <div class="snippet features" title="1800 PSI max pressure Auto start & stop function 60.24 fl oz. detergent tank"> <div class="content-section-header">Features</div> <ul class="content-section-list"> <li>1800 PSI max pressure</li> <li>Auto start & stop function</li> <li>60.24 fl oz. detergent tank</li> </ul> </div>
Watch Clearance Sale at eBay: Up to 70% off + free shipping
Shop discounts of up to 70% off on a large selection of watches in this clearance sale at eBay. Discounted brands include Tissot, Bulova, Raymond Weil, and more. Shop Now at eBay
Certified Refurb Makita 18V Hammer Drill & Impact Driver Kit for $168 + free shipping
<img src='https://d.dlnws.com/64599/1782639239-product-trimmed.jpg?h=76&w=125' style='float: left;vertical-align: top;margin: 0 8px 8px 0'><div class="snippet summary" title="At eBay, use promo code "SUNSHINE20" to get the refurb Makita 18V Hammer Drill & Impact Driver Kit for $168. It's the best deal we could find by $138. The kit includes a brushless hammer drill and a brushless impact driver, two 4.0Ah batteries, a charger, and a carrying bag. A 2-year warranty through Allstate is included. Coupon ends July 1."><p>At eBay, use promo code "SUNSHINE20" to get the refurb Makita 18V Hammer Drill & Impact Driver Kit for $168. It's the best deal we could find by $138. The kit includes a brushless hammer drill and a brushless impact driver, two 4.0Ah batteries, a charger, and a carrying bag. A 2-year warranty through Allstate is included. Coupon ends July 1. Buy Now at eBay</p></div> <div class="snippet features" title="18V LXT brushless hammer drill (1/2" chuck) and impact driver (1/4" hex) Two 4.0Ah lithium-ion batteries included Brushless motors"> <div class="content-section-header">Features</div> <ul class="content-section-list"> <li>18V LXT brushless hammer drill (1/2" chuck) and impact driver (1/4" hex)</li> <li>Two 4.0Ah lithium-ion batteries included</li> <li>Brushless motors</li> </ul> </div>
Certified Refurb WYBOT C1 Cordless Robotic Pool Cleaner for $216 + free shipping
<img src='https://d.dlnws.com/64599/1782638987-s-l400.jpg?h=101&w=125' style='float: left;vertical-align: top;margin: 0 8px 8px 0'><div class="snippet summary" title="At eBay, use promo code "SUNSHINE20" to get the refurb WYBOT C1 Cordless Robotic Pool Cleaner for $216. It's the best deal we've seen for this model in any condition and a low now by $164. A 2-year Allstate warranty is included. Sale ends July 1."><p>At eBay, use promo code "SUNSHINE20" to get the refurb WYBOT C1 Cordless Robotic Pool Cleaner for $216. It's the best deal we've seen for this model in any condition and a low now by $164. A 2-year Allstate warranty is included. Sale ends July 1. Buy Now at eBay</p></div> <div class="snippet features" title="Cordless, 25.2V / 65W motor Cleans floors, walls, waterlines & stairs Dual PVC brushes; compatible with tile, mosaic & glass surfaces"> <div class="content-section-header">Features</div> <ul class="content-section-list"> <li>Cordless, 25.2V / 65W motor</li> <li>Cleans floors, walls, waterlines & stairs</li> <li>Dual PVC brushes; compatible with tile, mosaic & glass surfaces</li> </ul> </div>
Certified Refurb MSI PRO MP165 E6 CT 15.6" FHD IPS Monitor for $48 + free shipping
<img src='https://d.dlnws.com/64599/1782638774-s-l1600.jpg?h=74&w=125' style='float: left;vertical-align: top;margin: 0 8px 8px 0'><div class="snippet summary" title="At eBay, use promo code "SUNSHINE20" to get the refurb MSI PRO MP165 E6 CT 15.6" FHD IPS Monitor for $48. It's the best price we could find by $14. A 2-year Allstate warranty is included. Coupon ends July 1."><p>At eBay, use promo code "SUNSHINE20" to get the refurb MSI PRO MP165 E6 CT 15.6" FHD IPS Monitor for $48. It's the best price we could find by $14. A 2-year Allstate warranty is included. Coupon ends July 1. Buy Now at eBay</p></div> <div class="snippet features" title="15.6" FHD (1920x1080) IPS panel 60Hz refresh rate, 4ms (GTG) response time 1 x HDMI 2.0a, 2 x USB-C (DP 1.2 w/ 15W PD) 2 x 1W built-in speakers"> <div class="content-section-header">Features</div> <ul class="content-section-list"> <li>15.6" FHD (1920x1080) IPS panel</li> <li>60Hz refresh rate, 4ms (GTG) response time</li> <li>1 x HDMI 2.0a, 2 x USB-C (DP 1.2 w/ 15W PD)</li> <li>2 x 1W built-in speakers</li> </ul> </div>
Refurb Dyson Deals at eBay: Up to 50% off + extra 20% off + free shipping
At eBay, use promo code "SUNSHINE20" to get an extra 20% off on a selection of already-discounted Dyson vacuum cleaners and air purifiers. A 2-year Allstate warranty is included with each model. Shipping is free. Coupon expires July 1. Shop Now at eBay
Certified Refurb EcoFlow River 3 Plus 286Wh Wireless Boost Combo & 5000mAh RAPID Power Bank for $149 + free shipping
<img src='https://d.dlnws.com/64599/1782637995-s-l1600.jpg?h=125&w=125' style='float: left;vertical-align: top;margin: 0 8px 8px 0'><div class="snippet summary" title="Apply promo code "SUNSHINE20" to drop this certified refurbished EcoFlow River 3 Plus combo to $149, down from $459. It's the best deal we could find by $185. The bundle pairs the 286Wh River 3 Plus power station with a detachable 5000mAh power bank that doubles as a wireless charging pad when docked. The unit runs on a LiFePO4 battery rated for 3,000 cycles and delivers 600W AC output with a 1,200W surge capacity. A 2-year Allstate warranty applies. Coupon ends July 1."><p>Apply promo code "SUNSHINE20" to drop this certified refurbished EcoFlow River 3 Plus combo to $149, down from $459. It's the best deal we could find by $185. The bundle pairs the 286Wh River 3 Plus power station with a detachable 5000mAh power bank that doubles as a wireless charging pad when docked. The unit runs on a LiFePO4 battery rated for 3,000 cycles and delivers 600W AC output with a 1,200W surge capacity. A 2-year Allstate warranty applies. Coupon ends July 1. Buy Now at eBay</p></div>
Certified Refurb Ninja Creami Deluxe 11-in-1 Ice Cream Maker for $142 + free shipping
<img src='https://d.dlnws.com/64599/1782637462-s-l400.jpg?h=125&w=125' style='float: left;vertical-align: top;margin: 0 8px 8px 0'><div class="snippet summary" title="Apply coupon code "SUNSHINE20" at checkout to get this certified refurb Ninja Creami Deluxe 11-in-1 Ice Cream Maker for $142. It's the second-best deal we've seen for this model. Shipping is free. A 2-year Allstate warranty applies. Coupon expires July 1."><p>Apply coupon code "SUNSHINE20" at checkout to get this certified refurb Ninja Creami Deluxe 11-in-1 Ice Cream Maker for $142. It's the second-best deal we've seen for this model. Shipping is free. A 2-year Allstate warranty applies. Coupon expires July 1. Buy Now at eBay</p></div> <div class="snippet features" title="11-in-1 functions 24-oz. XL pint capacity (two pints included)"> <div class="content-section-header">Features</div> <ul class="content-section-list"> <li>11-in-1 functions</li> <li>24-oz. XL pint capacity (two pints included)</li> </ul> </div>
24pk of crayons only $12 @ Walmart!
https://urlgeni.us/mavely/KOVv6
24pk of crayons only $12 @ Walmart! https://urlgeni.us/mavely/KOVv6
As Someone With Multiple Cats, Here Are The 35 Prime Day Pet Deals I Think You Don't Want To Miss
I'm officially ~on the prowl~ for the best deals on cat litter, toys, cleaning essentials, and other purr-ractical purchases — and these are worth pouncing on.
All The Best Things You Can Get On-Sale During The Target Circle Deal Days Event
Good news — the things you want and need are on sale!
Walmart's Summer Deals Event Has Arrived — Here Are All The Best Deals
Score $150 off Apple AirPods Max 2, take 33% off the popular Laneige lip mask, or pick up some Crocs clogs for half price.