Economist Eswar Prasad argues the cryptocurrency's value is a matter of faith.
同時也有7部Youtube影片,追蹤數超過70萬的網紅Spice N' Pans,也在其Youtube影片中提到,You must ditch your instant noodles for this super easy Soy Sauce Chicken Noodles. This recipe is suitable for those of you who are working from home....
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- 關於assign to 在 Taipei Ethereum Meetup Facebook 的最讚貼文
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- 關於assign to 在 Spice N' Pans Youtube 的最佳解答
- 關於assign to 在 Grace Maneerat Youtube 的最佳解答
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assign to 在 Taipei Ethereum Meetup Facebook 的最讚貼文
📜 [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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assign to 在 經濟部中小企業處 Facebook 的精選貼文
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assign to 在 Spice N' Pans Youtube 的最佳解答
You must ditch your instant noodles for this super easy Soy Sauce Chicken Noodles. This recipe is suitable for those of you who are working from home. It's so easy that I believe everyone can make this at home. Some of you ask how did we calculate 15 mins of cooking time as mentioned in our video title. First of all, we need to get our cooking time definition right. Cooking time to is means the time when heat is turned on and applied to the ingredients. All other time is not counted. In this video, Roland cooked the chicken for 8 mins then he turned off the heat. Then he brought the sauce to boil to thicken the sauce. At most this will only take 2 mins. Then he brought a pot of water to boil to blanch vegetables and noodles. Vegetables literally take seconds to cook and noodles take about 2 mins max to cook because we used fresh noodles. Assuming we assign about 1.5 mins to let the water boil then that brings us nicely to about 15 mins of cooking time altogether.
See the ingredient list below for your easy reference.
Hope you can recreate this yummy dish in the comfort of your home. Happy cooking!
Thanks for dropping by our channel. Please subscribe to stay tuned to our home cooking videos.
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See you soon.
------------------
Soy Sauce Chicken Noodles 豉油鸡面
Ingredients:
Serves 4 pax
-------
Marinated chicken
-------
2 pieces of boneless chicken leg (about 480g in total)
2 tablespoons light soy sauce
2 tablespoons premium dark soy sauce
Sauce
--------
800ml (27.05 fl oz) water
2 tablespoons light soy sauce
1 tablespoon oyster sauce
60ml (2.03 fl oz) premium dark soy sauce
4 cloves of garlic (lightly smashed)
0.5 piece star anise
0.5 piece cinnamon bark
1 stalk of spring onion (tied into a knot)
1 thumb-sized young ginger (lightly smashed)
20g (0.71 oz) rock sugar
Some cornstarch solution
Other ingredients
------------
Some leafy vegetables
Wonton noodles (about 70g or 2.47 oz for 1 pax)
===
Don't know where to get the ingredients or don't know how they look like? See the links below.
Light soy sauce https://amzn.to/3dBZuBY
Dark soy sauce https://amzn.to/3q9bXoW
Oyster sauce https://amzn.to/2VyjE9p
Star anise https://amzn.to/3vFSn4C
Cinnamon bark https://amzn.to/3wDPItE
Rock sugar https://amzn.to/3vzayc3
Cornstarch https://amzn.to/35jkDzv
----------
Looking for similar cooking equipment like the one we used in the video? These might interest you:
Greenpan sauce pan https://amzn.to/2SAGvne
Cast iron wok https://amzn.to/2TIOYVi
-------------
Filming equipment: iPhone 11 Pro Max (Get from Amazon https://amzn.to/3eA24tz)
Microphone: Sennheiser AVX digital wireless microphone system
Get Sennheiser wireless microphone in Singapore: https://singapore.sennheiser.com/products/avx-mke2-set-3-uk?_pos=2&_sid=adb86a9d8&_ss=r
Get Sennheiser wireless microphone from Amazon: https://amzn.to/2NILqMR
-----------------------------------
If you like this recipe, you might like these too:
Super Easy Restaurant Style Chinese Braised Noodles • Chicken Lo Mein 伊府面 Ee-Fu (Yee Fu) Mee Recipe
https://youtu.be/NR9O78XYKN4
Hong Kong Style Stir Fry Ramen Noodles w/ Chicken Chop 干炒鸡扒公仔面 Chinese Maggi Goreng Recipe
https://youtu.be/BAt4LlMzryY
Chinese Noodles w/ Scallion Sauce 葱油拌面
https://youtu.be/7ZAC099Xw3o
-----------------------------------
Disclaimer: Spice N' Pans is not related to these products and cannot guarantee the quality of the products in the links provided. Links are provided here for your convenience. We can only stand by the brands of the products we used in the video and we highly recommend you to buy them. Even then, preference can be subjective. Please buy at your own risk. Some of the links provided here may be affiliated. These links are important as they help to fund this channel so that we can continue to give you more recipes. Cheers!
assign to 在 Grace Maneerat Youtube 的最佳解答
หลังจากวันหยุดสงกรานต์ การบ้านก็ท่วมหัวอย่างเเท้ทรู สั่งมาเยอะเหมือนโกรธใครมา พักก่อนค่ะครู อยากให้ครูพัก!!! เเละนี่เป็นการผจญภัย 2 วันเต็ม กับการทำการบ้านทุกวิชา...(เหนื่อยมาก)
The teacher assumed that we had a lot of rest during the spring break, so the week after they decided to assign us a whole pile of assignments... This was how it went(it was not great)
-Partnering with UNICEF
"All views expressed on this video do not represent the opinions of
UNICEF, Youtube, or any other entity nor did I get paid to publish and produce this video"
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SONGS USED
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With lots of love and tomatoes?
assign to 在 Vy Vo Xuan Youtube 的最佳貼文
#windows10 #laptop #install
- Step 1 - Download ISO: 0:14
- Step 2 - Create Flash USB bootale: 04:27
- Step 3 - Install Windows 10: 09:00
The command used in this video :
1. diskpart
2. list disk
3. select disk x
4. clean
5. create partition primary
6. active
7. format fs=fat32 quick
8. assign
How to add an ssd m2 drive: https://youtu.be/37tFfTv7wFI
Asus TUF FX505GD-BQ324T: https://youtu.be/qn6UYyVdY8Y
assign to 在 Assigning issues and pull requests to other GitHub users 的推薦與評價
If no one is assigned to an issue or pull request, click assign yourself to assign yourself. The assign yourself item; In the right side menu, click Assignees. ... <看更多>
assign to 在 Do I assign something to me or do I assign it to myself? (Me ... 的推薦與評價
I assigned the task to myself displays a perfectly correct and natural usage of a reflexive pronoun with a ditransitive verb — as does I mailed the package to ... ... <看更多>
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