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Savour an array of amazing spread that celebrates flavours from around the world. The menu offers nutritious and healthy breakfast options, a selection of fresh fruit juices, artisanal coffee and wholesome international and local favourites. 💥
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Garden Court Café serves all day breakfast and lunch from 7.30am to 2.30pm. Diners can opt to dine indoors or outdoors in the Oval Garden.
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同時也有570部Youtube影片,追蹤數超過5萬的網紅錶哥學良Edgar Jiang,也在其Youtube影片中提到,#HORAGE #Array 即將停產,最後為大家做個完整介紹。開放式面盤,#K1機芯 大日期顯示機制一覽無遺,建議售價:台幣69,000。 有興趣的朋友可以透過以下方式和品牌預約賞錶。 官方網站 https://zh.horage.info/ 預約賞錶 https://lin.ee/4ZLfCC...
「array」的推薦目錄:
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array 在 Taipei Ethereum Meetup Facebook 的精選貼文
📜 [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
array 在 PHOLFOODMAFIA - พลพรรคนักปรุง Facebook 的最佳解答
#ยำเห็ดรวมผักกาดแก้ว
😋🍴 ยำเห็ดหลากชนิด เสิร์ฟมากับผักกาดแก้วกรอบๆ จะเสิร์ฟในลักษณะเป็นจานยำ หรือเมี่ยงก็ได้เช่นกัน สามารถปรับเป็นรูปแบบมังสวิรัติด้วยการเปลี่ยนจากน้ำปลาเป็นซีอิ๊วขาวหรือโชยุได้👍🏼 สูตรโดย : พล ตัณฑเสถียร
ดูสูตรคลิกที่ลิงก์ https://bit.ly/39oUwcl
VDO : https://fb.watch/8bIqzsTDaR/
🛒 สนใจสั่งซื้อผลิตภัณฑ์คิง 🌾
สามารถช้อปออนไลน์ได้ที่ shopee
https://shopee.prf.hn/l/7JP0qgW
Mushroom Spicy Salad
This spicy salad comes with flavourful array of mushrooms, can be served in wrap style or as a traditional salad.
Recipe by Phol Tantasathien
To get the recipe https://bit.ly/39oUwcl
VDO : https://fb.watch/8bIqzsTDaR/
#ตามสั่งตามนั้น #ตามสั่ง #อาหารตามสั่ง #กินดี #ยำเห็ดรวม #ยำเห็ดหลากชนิด #แจกสูตร
array 在 錶哥學良Edgar Jiang Youtube 的最讚貼文
#HORAGE #Array 即將停產,最後為大家做個完整介紹。開放式面盤,#K1機芯 大日期顯示機制一覽無遺,建議售價:台幣69,000。
有興趣的朋友可以透過以下方式和品牌預約賞錶。
官方網站 https://zh.horage.info/
預約賞錶 https://lin.ee/4ZLfCCD
array 在 數學老師張旭 Youtube 的最佳解答
今天談談實際的案例
上一堂課 👉 Array 陣列 (https://youtu.be/d8avg9WRF3k)
【張旭無限教室線上課程平台】
2021 年年初,張旭老師建置了一個線上課程平台
除了放張旭老師的線上課程以外
也有其他與張旭老師合作的老師們的課程
👉 https://changhsumath.com
【版權宣告】
本影片版權為張旭 (張舜為) 老師和 Hank 老師所有
嚴禁用於任何商業用途⛔
如果有學校老師在課堂使用我的影片的話
請透過以下聯絡方式通知我讓我知道,謝謝
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array 在 數學老師張旭 Youtube 的最佳貼文
今天教函式呼叫
上一堂課 👉 Function 函式呼叫 (https://youtu.be/2VQ8JS8bNyA)
下一堂課 👉 等下周
【張旭無限教室線上課程平台】
2021 年年初,張旭老師建置了一個線上課程平台
除了放張旭老師的線上課程以外
也有其他與張旭老師合作的老師們的課程
👉 https://changhsumath.com
【版權宣告】
本影片版權為張旭 (張舜為) 老師和 Hank 老師所有
嚴禁用於任何商業用途⛔
如果有學校老師在課堂使用我的影片的話
請透過以下聯絡方式通知我讓我知道,謝謝
FB:https://www.facebook.com/changhsumath
IG:https://www.instagram.com/changhsumath
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