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營業時間:星期一至五 / 11am - 7pm
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同時也有324部Youtube影片,追蹤數超過9萬的網紅小雨Wayne Shih,也在其Youtube影片中提到,Discord: https://discord.gg/6KWbVYKxdc 粉絲專頁:https://www.facebook.com/WayneShih78/ 想知道我有賣什麼? https://www.cafedrizzle.com.tw **MUSIC** -The Future Is...
「x number」的推薦目錄:
- 關於x number 在 Toto湯沛宜 Facebook 的最讚貼文
- 關於x number 在 Taipei Ethereum Meetup Facebook 的最佳解答
- 關於x number 在 Facebook 的精選貼文
- 關於x number 在 小雨Wayne Shih Youtube 的最讚貼文
- 關於x number 在 Mrs. Raven烏鴉太太 Youtube 的最讚貼文
- 關於x number 在 よかろうもん Youtube 的最佳貼文
- 關於x number 在 Number Eight Hair Salon ∞ 旗艦店 - Facebook 的評價
- 關於x number 在 Counting the number of elements with the values of x in a vector 的評價
- 關於x number 在 What does $2^x$ really mean when $x$ is not an integer? 的評價
x number 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.
👏 歡迎轉載分享鼓掌
x number 在 Facebook 的精選貼文
Let's celebrate International Coffee month with NESCAFÉ®. During this coffee month, NESCAFÉ® rewarding their loyal customers with amazing prizes. “Peraduan NESCAFÉ® – Vibe Kopi” WhatsApp contest, offering 324 prizes worth a total of RM290,000.00 to be won, including 18 x Honda Vario 150 Repsol! The contest will be held from 6 September – 7 November 2021.
Here is how to participate:
Step 1 : Purchase a minimum of RM6 worth of any participating NESCAFÉ® Can/Bottle/Cup products in a single original receipt from any participating outlets (in-store or online).
Step 2 : Write your full name and identification number on the front of the receipt and submit a CLEAR picture of the receipt and total amount to the WhatsApp number: 018-388 0070. The contest participation is accepted via WhatsApp only.
More information check out @Nestle.Malaysia
#NESCAFEVibeKopi #NESCAFECans #readytodrink #coffee @inkpr.my
x number 在 小雨Wayne Shih Youtube 的最讚貼文
Discord: https://discord.gg/6KWbVYKxdc
粉絲專頁:https://www.facebook.com/WayneShih78/
想知道我有賣什麼? https://www.cafedrizzle.com.tw
**MUSIC**
-The Future Is Now by MARLOE. (Download from Artlist.io)
-The Day I Know I Needed You by MARLOE. (Download from Artlist.io)
-Your Captain by Banana Split (Download from Artlist.io)
License Owner:Wayne Shih
License Number:842810
x number 在 Mrs. Raven烏鴉太太 Youtube 的最讚貼文
訂閱我吧:https://bit.ly/39KYV8N
我的instagram: https://reurl.cc/l0jk3A
帳號👀 @by.mrsraven
合作邀約:mrsraven20@gmail.com
KINGRINDER磨豆機:https://lihi1.cc/qcm7Z
BALMUDA The Pot 手沖壺
Chemex 經典手沖玻璃咖啡濾壺(玻璃把)
KALITA x Hasami 101系列波佐見燒陶瓷濾杯
CAFEDE KONA 雙層不鏽鋼濾網
Kalita 手沖耐熱玻璃壺-玻璃手把
ANKOMN|2-in-1聰明定量匙
自從開始練習手沖
除了飲用
感覺跟咖啡的連結跟喜好
好像有了更深一層的理解
今天收到KINGRINDER的邀請
想來跟大家分享
我這個手沖新手將近一年來使用的一些用具
還有我的使用心得
如果對於手沖咖啡有興趣的朋友
或是想知道我如何選擇我的濾杯或工具的
就一起跟我來看看吧
Music
Artlist Licensed via https://artlist.io/
License Number 540466
#烏鴉太太 #簡單生活練習 #夫妻生活 #2021vlog #lifestyle #brunch #coupleslife
x number 在 よかろうもん Youtube 的最佳貼文
『 天ノ弱 / 164 』cover by Masaru(YOKARO-MON) x 天音(ハイスクール・バンバン)
https://youtu.be/Y7r-NyCHfhY
■ハイスクール・バンバン
【YouTube】
https://youtube.com/channel/UCWum0XIZ4QEbnjtt7cxQC-Q
【TikTok】
https://vt.tiktok.com/ZSJmbGGbs/
【Twitter】
https://twitter.com/hsbb_staffs
オリジナル楽曲配信中です😎
▶︎ "Colors" https://big-up.style/4I1bUsGCIV
MV : https://youtu.be/r2GpHMHjkMk
▶︎ "JOY" https://big-up.style/8N3atrOjZs
MV : https://youtu.be/tqAW82VVW2g
▶︎ “Record”
MV : https://youtu.be/15sIzxoNYFU
古橋息吹
▪️Instagram
https://www.instagram.com/ibu_beat
▪️Twitter
https://twitter.com/ibu_beat
Takuya
▪️Twitter
https://twitter.com/ta98chan
▪️Instagram
https://www.instagram.com/0314ta98
ご本家様
back number - 瞬き (full)
https://www.youtube.com/watch?v=h-KuoHHjGRs
音源お借りいたしました
Hiroのピアノ伴奏アレンジ
https://www.youtube.com/channel/UCWX2b3xIeJHoiNOPd9nTuKA
【ピアノ伴奏】瞬き / back number 映画「8年越しの花嫁 奇跡の実話」主題歌
https://www.youtube.com/watch?v=7Gn57oxU69M
こんにちはー!よかろうもんです!
今回は動画をご覧いただきありがとうございます!
よかったら高評価!チャンネル登録よろしくお願いします!!
そいぎー!!
【オフィシャルグッズはこちらから!!】
https://fanicon.net/web/shops/1178
【オフィシャルファンクラブはこちらから!】
https://fanicon.net/fancommunities/1178
【お問い合わせはこちらまで】
http://www.yoshidamasaki.com/contact/
【毎週土曜日 20:00 動画アップ】
よかろうもんのチャンネル登録よろしくお願いします!
https://www.youtube.com/c/YOKAROUMON
福岡県出身の音楽を中心としたエンターテインメントグループです。
コメント欄やTwitterにてカバー曲のリクエストなどもお待ちしております!
++++Twitter&Instagram++++
-Official-
▪️Twitter
https://twitter.com/ykrm_official
- Masaru -
▪️Twitter
https://twitter.com/masaosp
▪️Instagram
https://www.instagram.com/masaru_masaosp
- Daichi -
▪️Twitter
https://twitter.com/daichibeatboxer
▪️Instagram
https://www.instagram.com/daichibeatboxer
- Yudai -
▪️Twitter
https://twitter.com/yuuuum_yudai_
▪️Instagram
https://www.instagram.com/yuuuum.yudai
- Hiro -
▪️Twitter
https://twitter.com/Bakamono_yo
▪️Instagram
https://www.instagram.com/bakamono_yo
-Takuya -
▪️Twitter
https://twitter.com/ta98chan
▪️Instagram
https://www.instagram.com/0314ta98
x number 在 What does $2^x$ really mean when $x$ is not an integer? 的推薦與評價
We can then definite exponentation over more general sets of numbers in a way that these two properties ... logcy is defined as the number x such that cx=y. ... <看更多>
x number 在 Number Eight Hair Salon ∞ 旗艦店 - Facebook 的推薦與評價
Jay x Hair Designer 漸層色系深色搭配室內和室外創造出不同的霧色感效果採用: 日本娜普菈染劑日本娜普菈三段式護髮打底使用摩洛哥堅果油預約方式: Line ... ... <看更多>