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同時也有1242部Youtube影片,追蹤數超過4萬的網紅阿康嚼舌根GOODSKANG,也在其Youtube影片中提到,買了 iPhone 13 之後最重要的就是我們該怎麼傳輸資料嘛,那這部影片就是希望幫助大家好好備份自己的 iPhone 13 囉! =========================== 🤩來挑最防摔的犀牛盾📱:https://url.rhinoshield.tw/kang13s 折扣碼:ytkan...
「in any case」的推薦目錄:
- 關於in any case 在 NicoleYie Facebook 的最佳解答
- 關於in any case 在 Taipei Ethereum Meetup Facebook 的最讚貼文
- 關於in any case 在 全聯建築技術機構 -許偉揚.瓦建設計 Facebook 的精選貼文
- 關於in any case 在 阿康嚼舌根GOODSKANG Youtube 的精選貼文
- 關於in any case 在 阿康嚼舌根GOODSKANG Youtube 的最佳解答
- 關於in any case 在 阿康嚼舌根GOODSKANG Youtube 的最讚貼文
- 關於in any case 在 Should I use "in any case" or "in either case" in this example? 的評價
in any case 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.
👏 歡迎轉載分享鼓掌
in any case 在 全聯建築技術機構 -許偉揚.瓦建設計 Facebook 的精選貼文
921大地震 (集集大地震),在1999年9月21日 凌晨1點47分15.9秒發生在臺灣中部山區的逆斷層型地震,總共持續大約102秒。
這場地震造成2,415人罹難,29人失蹤,11,305人受傷,51,711棟房屋全倒,53,768棟房屋半倒。
今年的 #中秋節,恰逢 #921大地震22周年, 回首山河變色那一夜,我們更珍惜與家人團圓聚首的這一天 !
九二一紀念型式 / 2002遠東國際數位建築競圖獎
01-INTRODUTION
Therefore before the memorial form does not yet model,What does – our attempt that I ask first is memorial?
Then artificial corpus city of civilization that construct or purchase, how many thousand years since then, always tell to say with the story that the nature match. But at win the nature at the same time, but neglect the unknowable power of great universe.
Usually in the nature of breakage of at the same time, crisis is hatching. This legal case, primarily and just attempt by the innate character that the formation of the memorial hall study the affairs to celebrate why? How the memory of the affairs of disaster is through concrete of emersion of building space.
02-Site
The choice of the position of base also not is to in advance plan to like of, but is through the imagine of the concept of design and filter but find out to most have to symbolize the base of the meaning. In fact ,921 the first step of memorial hall of earthquakeses plan, and then hope the memorial place is an occurrence on aly purely of the earthquake break the layer to take, rather than the death and harm of earthquake is miserably heavy location. With one kind of more detached attitude, afresh come considering the relation of mankind and nature.
03-Concept
Whole celebrates the scope of amenity, from the dam of the deformation, along seismicly break the layer to take to extend to the big bridge that dilapidated. Artificial with not artificial coexistence is on the earth crust of this deformation. Install the project: dam is with the memorial entrance of amenity of big each conduct and actions of bridge, whole celebrate the space to have no any word of text and record of like diagram, and only come illustrating all facts with the glossary of space.
04-Space 斷&續
Break- parable deformation and despair Continuously- the parable continues and eternity Interesting is, the break and continuously is a logic to exist together. Thering is break then can describe the continuously, thering is continuously then can describe the break
in any case 在 阿康嚼舌根GOODSKANG Youtube 的精選貼文
買了 iPhone 13 之後最重要的就是我們該怎麼傳輸資料嘛,那這部影片就是希望幫助大家好好備份自己的 iPhone 13 囉!
===========================
🤩來挑最防摔的犀牛盾📱:https://url.rhinoshield.tw/kang13s
折扣碼:ytkang2109
===========================
-
-
===========================
阿康 IG & FB
IG:https://instagram.com/goodskang
FB :https://www.facebook.com/goodskang/
===========================
想贊助阿康更多經費拍片可以這兩種方式
1.) 至阿康的蝦皮消費:https://sho.pe/3grd6p
2.) 加入頻道會員:https://www.youtube.com/channel/UCuQ7s6G50qzqgDbQB6qKDDw/join
===========================
-
-
===========================
拍攝器材:Sony a6400 + SEL18135, iPhone 12 Pro Max / iPhone 11 Pro, 智雲Smooth 4, GoPro Max
收音設備:RODE Wireless Go, 鐵三角 audio-technica AT9934, RODE VideoMicro, iPhone 12 Pro Max / iPhone 11 Pro 和 GoPro Max 內建
剪輯軟體:Final Cut Pro X
背景音樂:Epidemicsound, https://www.epidemicsound.com/referral/weo8gd/
===========================
影片企劃:阿康 Kang
影片攝影:阿康 Kang
後製剪輯:阿康 Kang
===========================
素材與資料來源 Source / Reference:
官網、Pexels (若有非我實拍)
===========================
版權聲明:此影片若有採用任何素材,皆以幫助素材擁有者推廣為主,若有採用都會在影片敘述標注讓觀眾知道出處與來源,若版權擁有者對於附註或是其餘想法問題,還請讓我知道
Content / Right:All Material / Section / Pictures / in this video is 100% in order to help the source owners gain more exposure, all reference / credit is obviously attached in the description for viewers, any content that may be right-violated or unclear please feel free to let me know.
=========廠商專區==========
工商影片秉持公開、公正原則
所以我在影片內一定會提廠商 Sponsor 資訊
還請各位廠商大大乾爹乾媽們見諒囉!
===========================
合作邀約請寄:goodskang@gmail.com
或是也可到我的 Facebook & IG 私訊,可能會比較快收得到哦!
===========================
#iPhone13 #iPhone13Pro #iPhone13ProMax #iPhone13Pro開箱 #iPhone13ProMax開箱
in any case 在 阿康嚼舌根GOODSKANG Youtube 的最佳解答
iPhone 13 mini 算是最特別的一支 iPhone 13 了!那之前也開箱過 iPhone 13 跟 iPhone 13 Pro 這次來瞧瞧今年的 iPhone 13 mini 電量有沒有什麼進步囉
===========================
OVERDIGI 官網(可立即出貨):
https://reurl.cc/ARkYZp
折扣碼: goodskang
OVERDIGI 蝦皮官方商城:
https://reurl.cc/N6N8Gx
===========================
非台灣的海外觀眾轉運購買連結:
https://www.pinkoi.com/product/czbDyBms
===========================
-
-
===========================
阿康 IG & FB
IG:https://instagram.com/goodskang
FB :https://www.facebook.com/goodskang/
===========================
想贊助阿康更多經費拍片可以這兩種方式
1.) 至阿康的蝦皮消費:https://sho.pe/3grd6p
2.) 加入頻道會員:https://www.youtube.com/channel/UCuQ7s6G50qzqgDbQB6qKDDw/join
===========================
-
-
===========================
拍攝器材:Sony a6400 + SEL18135, iPhone 12 Pro Max / iPhone 11 Pro, 智雲Smooth 4, GoPro Max
收音設備:RODE Wireless Go, 鐵三角 audio-technica AT9934, RODE VideoMicro, iPhone 12 Pro Max / iPhone 11 Pro 和 GoPro Max 內建
剪輯軟體:Final Cut Pro X
背景音樂:Epidemicsound, https://www.epidemicsound.com/referral/weo8gd/
===========================
影片企劃:阿康 Kang
影片攝影:阿康 Kang
後製剪輯:阿康 Kang
===========================
素材與資料來源 Source / Reference:
官網、Pexels (若有非我實拍)
===========================
版權聲明:此影片若有採用任何素材,皆以幫助素材擁有者推廣為主,若有採用都會在影片敘述標注讓觀眾知道出處與來源,若版權擁有者對於附註或是其餘想法問題,還請讓我知道
Content / Right:All Material / Section / Pictures / in this video is 100% in order to help the source owners gain more exposure, all reference / credit is obviously attached in the description for viewers, any content that may be right-violated or unclear please feel free to let me know.
=========廠商專區==========
工商影片秉持公開、公正原則
所以我在影片內一定會提廠商 Sponsor 資訊
還請各位廠商大大乾爹乾媽們見諒囉!
===========================
合作邀約請寄:goodskang@gmail.com
或是也可到我的 Facebook & IG 私訊,可能會比較快收得到哦!
===========================
#iPhone13 #iPhone13mini #iPhone13Pro #iPhone13ProMax #iPhone13Pro開箱 #iPhone13ProMax開箱
in any case 在 阿康嚼舌根GOODSKANG Youtube 的最讚貼文
iPhone 13 推出很多人在詢問是不是該申辦 5G?所以今天就來外出實測一下囉
===========================
🤩來挑最防摔的犀牛盾📱:https://url.rhinoshield.tw/kang13s
折扣碼:ytkang2109
===========================
-
-
===========================
阿康 IG & FB
IG:https://instagram.com/goodskang
FB :https://www.facebook.com/goodskang/
===========================
想贊助阿康更多經費拍片可以這兩種方式
1.) 至阿康的蝦皮消費:https://sho.pe/3grd6p
2.) 加入頻道會員:https://www.youtube.com/channel/UCuQ7s6G50qzqgDbQB6qKDDw/join
===========================
-
-
===========================
拍攝器材:Sony a6400 + SEL18135, iPhone 12 Pro Max / iPhone 11 Pro, 智雲Smooth 4, GoPro Max
收音設備:RODE Wireless Go, 鐵三角 audio-technica AT9934, RODE VideoMicro, iPhone 12 Pro Max / iPhone 11 Pro 和 GoPro Max 內建
剪輯軟體:Final Cut Pro X
背景音樂:Epidemicsound, https://www.epidemicsound.com/referral/weo8gd/
===========================
影片企劃:阿康 Kang
影片攝影:阿康 Kang
後製剪輯:阿康 Kang
===========================
素材與資料來源 Source / Reference:
官網、Pexels (若有非我實拍)
===========================
版權聲明:此影片若有採用任何素材,皆以幫助素材擁有者推廣為主,若有採用都會在影片敘述標注讓觀眾知道出處與來源,若版權擁有者對於附註或是其餘想法問題,還請讓我知道
Content / Right:All Material / Section / Pictures / in this video is 100% in order to help the source owners gain more exposure, all reference / credit is obviously attached in the description for viewers, any content that may be right-violated or unclear please feel free to let me know.
=========廠商專區==========
工商影片秉持公開、公正原則
所以我在影片內一定會提廠商 Sponsor 資訊
還請各位廠商大大乾爹乾媽們見諒囉!
===========================
合作邀約請寄:goodskang@gmail.com
或是也可到我的 Facebook & IG 私訊,可能會比較快收得到哦!
===========================
#iPhone13 #iPhone13Pro #iPhone13ProMax #iPhone13Pro開箱 #iPhone13ProMax開箱
in any case 在 Should I use "in any case" or "in either case" in this example? 的推薦與評價
"Any", as you seem to recognize, does give an implication that there are multiple options. However, "in either case" is used less frequently ... ... <看更多>