雖然這篇Theoretically 中文鄉民發文沒有被收入到精華區：在Theoretically 中文這個話題中，我們另外找到其它相關的精選爆讚文章
在 theoretically產品中有51篇Facebook貼文，粉絲數超過3,460的網紅Taipei Ethereum Meetup，也在其Facebook貼文中提到， 📜 [專欄新文章] Gas Efficient Card Drawing in Solidity ✍️ Ping Chen 📥 歡迎投稿： https://medium.com/taipei-ethereum-meetup #徵技術分享文 #使用心得 #教學文 #medium Assign r...
同時也有2部Youtube影片，追蹤數超過94萬的網紅JSK-koubou，也在其Youtube影片中提到，Hello friends. This is the official channel of JSK-koubou. Here you can find many interesting videos about homemade machinery, woodworking projects, p...
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theoretically 在 嘉力的籃球生活? Instagram 的最讚貼文
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theoretically 在 greta lai Instagram 的最佳解答
2020-12-15 14:57:55
Lockdown officially begins! Well theoretically it already started last Thursday but since I had planned on taking a few days off before all this happe...
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theoretically 在 JSK-koubou Youtube 的最佳貼文
2021-05-23 10:09:56Hello friends.
This is the official channel of JSK-koubou.
Here you can find many interesting videos about homemade machinery, woodworking projects, plans and life hacks.
Click here for the plan
https://jisaku-koubou.com/downloads/vacuum-clamp
I have created a vacuum clamping system that can clamp materials quickly.
It utilizes a device that evacuates using compressed air.
The device that creates the vacuum costs only $ 15.
The vacuum area is 13.9 cm x 13.9 cm
The ultimate vacuum of the vacuum equipment used is -92kPa.
Theoretically, it is possible to chuck with a force of 179 kgf.
It can be adjusted to an angle that is easy to use, and the clamp does not get in the way, so work progresses.
Since it uses a rubber sealing, no clamp marks are left on the wood.
[Plan List]
https://jsk-koubou.stores.jp/![post-title]()
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theoretically 在 Jessica Vu Youtube 的最讚貼文
2017-12-20 07:01:012 days until winter is officially here ~ Today I'm going to show you a 3-step skincare routine for dry skin + everyday winter makeup to welcome the new season ❄
Bio Clarity code for 50% off first month: "JESSICAVU" http://bit.ly/2BafwVj
FOLLOW ME!
✧ IG: http://www.instagram.com/jessyluxe
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✧ SOUNDCLOUD: https://soundcloud.com/jessyluxe
✧ TWITTER: https://twitter.com/luxejessy
__________________________________________
Hello~ Today's makeup look is the most natural one I've done on my channel. I don't like doing heavy makeup when it's cold outside although I'm not really sure why that is since theoretically my makeup should last longer..（｡･Д･｡）???
I played with shimmery and glittery shadows today as well. I usually prefer matte eyeshadows but since this look is so natural, I had to add some ✧・ﾟ:* sparkle *:・ﾟ✧ to the eyes
Throughout summer, I like to use coral blushes across my nose to get the sunkissed effect but when winter comes, I switch to pastel blushes. You know how your face gets flushed when you've been out in the cold for too long? I think pastel blushes capture that perfectly ! in a cute way + without the being cold part (⁎❝᷀ົ ˙̫ ❝᷀ົ⁎)
Are you traveling anywhere this winter? I'm thinking of going to Vancouver to see the snow ? We shall see.
♡ xo
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SKINCARE:
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EYES:
[$21] Anastasia Beverly Hills Brow Wiz (Taupe) http://bit.ly/2yVrqMN
[$8] NYX Build 'Em Up Brow Powder (Ash Brown) http://bit.ly/2yVs5xL
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[$12] ColourPop Take Me Home Eye Shadow Palette (Side Tracked) http://bit.ly/2BdT5P2
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FACE:
[$23] Etude House Glow On Oil Volume Base (Universe Special Edition) http://bit.ly/2CZJdWp ("JESSICAVU10" for 10% off) http://bit.ly/2BgIy1y
[$9] Maybelline FaceStudio Master Conceal Concealer (Light) http://bit.ly/2yVKxXn
[$14] NYX Total Control Drop Foundation (True Beige) http://bit.ly/2g6OwwE
[$22] Urban Decay Eyeshadow Primer Potion (Eden) http://bit.ly/2AUHpwB
[$38] Laura Mercier Translucent Loose Setting Powder http://bit.ly/2lu5xTA
[$44] Kevyn Aucoin The Sculpting Contour Powder (Medium) http://bit.ly/2kIvivT
[$16] Etude House Lovely Cookie Blusher (Peach Parfait) http://bit.ly/2oK3QCY ("JESSICAVU10" for 10% off) http://bit.ly/2BgIy1y
[$11] Sleek MakeUP Blush By 3 Palette (Take a Cheeky Peek) http://bit.ly/2kImV3o
[$34] FENTY BEAUTY by Rihanna Killawatt Freestyle Highlighter (Mean Money/Hu$tla Baby) http://bit.ly/2Co7hBo
LIPS:
[$4] NYX Slim Lip Pencil (Peekaboo Neutral) http://bit.ly/2BleQtg
[$18] Anastasia Beverly Hills Pro Pencil (Base 1) http://bit.ly/2oIvgJx
[$20] ColourPop Amber Crystal Collection Bundle (Lip Balm) http://bit.ly/2zRROcV
CONTACT LENSES:
[$16] O-Lens Russian Velvet Brown http://bit.ly/2yPWZuU http://bit.ly/2CTTSBi
T O O L S
("JESSYLUXE" for 10% off Sigma products)
[$14] It Cosmetics Brushes for ULTA Airbrush All-Over Shadow Brush (#119) http://bit.ly/2y77LLh
[$20] the original beautyblender http://bit.ly/2CWBbh3
[$8.59] Real Techniques Flawless Base Brush Set (Contour) http://bit.ly/2fWGVNz
[$13] It Cosmetics Brushes For ULTA Airbrush Precision Shadow Brush (#112) http://bit.ly/2iCSoqf
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[$29] Top: Dabagirl Turtleneck Wide Sleeve Knit Top (Green / One Size) http://bit.ly/2BiHMCf
Earrings: No longer available
T E C H
Camera: Canon Rebel T6i
Lens: Kit Lens EF-S 18-55mm f/3.5-5.6 IS STM Lens + Canon EF 85mm f/1.8 USM 85mm Lens
Mic: Rode Videomic Go
SD Card: Lexar SDXC Class 10 128 GB
Editing Program: Final Cut Pro X 10.3.2
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Sweden Laundry (스웨덴세탁소) - Just Christmas
마마무 (MAMAMOO) - 그리고 그리고 그려봐 (Memory)
FTC: Some of these links are affiliate links![post-title]()
theoretically 在 Taipei Ethereum Meetup Facebook 的最佳解答
📜 [專欄新文章] Gas Efficient Card Drawing in Solidity
✍️ Ping Chen
📥 歡迎投稿： https://medium.com/taipei-ethereum-meetup #徵技術分享文 #使用心得 #教學文 #medium
Assign random numbers as the index of newly minted NFTs
Scenario
The fun of generative art NFT projects depends on randomness. The industry standard is “blind box”, where both the images’ serial number and the NFTs’ index are predetermined but will be shifted randomly when the selling period ends. (They call it “reveal”) This approach effectively solves the randomness issue. However, it also requires buyers to wait until the campaign terminates. What if buyers want to know the exact card right away? We’ll need a reliable onchain card drawing solution.
The creator of Astrogator🐊 isn’t a fan of blind boxes; instead, it thinks unpacking cards right after purchase is more interesting.
Spec
When initializing this NFT contract, the creator will determine the total supply of it. And there will be an iterable function that is randomly picking a number from the remaining pool. The number must be in range and must not collide with any existing ones.
Our top priority is accessibility/gas efficiency. Given that gas cost on Ethereum is damn high nowadays, we need an elegant algorithm to control gas expanse at an acceptable range.
Achieving robust randomness isn’t the primary goal here. We assume there’s no strong financial incentive to cheat, so the RNG isn’t specified. Implementers can bring their own source of randomness that they think is good enough.
Implementation
Overview
The implementation is pretty short and straightforward. Imagine there’s an array that contains all remaining(unsold) cards. When drawIndex() is called, it generates a (uniform) random seed to draw a card from the array, shortens the array, and returns the selected card.
Algorithm
Drawing X cards from a deck with the same X amount of cards is equal to shuffling the deck and dealing them sequentially. It’s not a surprise that our algorithm is similar to random shuffling, and the only difference is turning that classic algo into an interactive version.
A typical random shuffle looks like this: for an array with N elements, you randomly pick a number i in (0,N), swap array[0] and array[i], then choose another number i in (1,N), swap array[1] and array[i], and so on. Eventually, you’ll get a mathematically random array in O(N) time.
So, the concept of our random card dealing is the same. When a user mints a new card, the smart contract picks a number in the array as NFT index, then grabs a number from the tail to fill the vacancy, in order to keep the array continuous.
Tweak
Furthermore, as long as the space of the NFT index is known, we don’t need to declare/initialize an array(which is super gas-intensive). Instead, assume there’s such an array that the n-th element is n, we don’t actually initialize it (so it is an array only contains “0”) until the rule is broken.
For the convenience of explanation, let’s call that mapping cache. If cache[i] is empty, it should be interpreted as i instead of 0. On the other hand, when a number is chosen and used, we’ll need to fill it up with another unused number. An intuitive method is to pick a number from the end of the array, since the length of the array is going to decrease by 1.
By doing so, the gas cost in the worst-case scenario is bound to be constant.
Performance and limitation
Comparing with the normal ascending index NFT minting, our random NFT implementation requires two extra SSTORE and one extra SLOAD, which cost 12600 ~ 27600 (5000+20000+2600) excess gas per token minted.
Theoretically, any instantly generated onchain random number is vulnerable. We can restrict contract interaction to mitigate risk. The mitigation is far from perfect, but it is the tradeoff that we have to accept.
ping.eth
Gas Efficient Card Drawing in Solidity was originally published in Taipei Ethereum Meetup on Medium, where people are continuing the conversation by highlighting and responding to this story.
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theoretically 在 Gizmodo Japan Facebook 的最讚貼文
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theoretically 在 Engadget Facebook 的最讚貼文
The company’s first repairable notebook shouldn’t be treated with kid gloves.