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Shout out to @bubblebodihk for inviting me to be the cover of their “First Issue” ✌️ To all the ladies :There is no reason needed to love yourself ❤️
多謝全新女性雜誌 [Bubble Bodi ]邀請我擔任佢哋”創刊號9月號2021”嘅封面！
#愛自己不為什麼
MU STEPHENMAKEUP
Hair @zaptang
20 CỤM TỪ ĐỒNG NGHĨA PHỔ BIẾN [Kèm ví dụ cụ thể]
▪to be harmful to … ≈ to be detrimental to …: có hại cho …
▪to have a negative effect on … ≈ to have an adverse impact on …: có ảnh hưởng tiêu cực lên …
▪the primary cause of … ≈ the principal cause of …: nguyên nhân chính của vấn đề gì
▪the main reason for … ≈ the primary reason for …: lý do chính cho vấn đề gì
▪every day ≈ on a daily basis: hàng ngày
▪every week ≈ on a weekly basis: hàng tuần
▪every year ≈ on an annual basis: hàng năm
▪nowadays ≈ these days ≈ today ≈ in modern society = in today’s society: ngày nay
▪to solve a problem ≈ to tackle an issue: giải quyết 1 vấn đề
▪in recent times ≈ in recent years: trong những năm gần đây
▪to lead to … ≈ to result in …: dẫn tới vấn đề gì
▪some people believe that … ≈ it is believed that …: một số người tin rằng …
▪others argue that … ≈ other people think that …: một số khác nghĩ rằng …
▪we do not need to … ≈ it is no longer necessary to …: không cần thiết làm gì
▪to be important ≈ to play an important role: quan trọng
▪benefits ≈ merits ≈ advantages ≈ beneficial effects: lợi ích
▪drawbacks ≈ disadvantages ≈ negative effects: bất lợi
▪solution ≈ measure ≈ approach: giải pháp
▪the best way to … ≈ the most effective method to …: cách tốt nhất để …
▪the government should … ≈ it is necessary for the government to …: chính phủ cần làm gì
PHẦN VÍ DỤ: https://ielts-nguyenhuyen.com/20-cum-tu-dong-nghia/
#ieltsnguyenhuyen
📜 [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
背景音樂:影片片尾備註
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Video Clip Sources:
https://www.reddit.com/r/leagueoflegends/
https://medal.tv/league-of-legends
Fan contribution
music Sources:
youtube.com/user/NoCopyrightSounds
youtube.com/user/MonstercatMedia
youtube.com/user/freemusicwave
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感謝你的觀看，歡迎分享，也可以訂閱我，隨時追蹤最新影片
剪輯好笑的每周VOD精華及噴笑嗑藥台式翻譯
希望能讓精華更有趣 翻譯並非正統可能有錯或超譯 請見諒
我們也經常剪輯英雄聯盟搞笑爆笑，技術，中文翻譯，實況主選手等的影片，也可以在下方留言，讓我幫你剪輯介紹給大家認識。
諮詢信箱:sgdlolhigh69@gmail.com
投稿信箱:sgdlolhigh69@gmail.com(絕地求生暫時停止投稿，僅接受英雄聯盟)
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Video and music has the player's permission to feature their clip .was shared by the owner and allowed for use or we purchased.
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COPYRIGHT ISSUES:
We make these videos with the intention of educating LoL players how to increase and improve own skills for better playing in some segments of the game, but to share those in quality compilation with other people.
One of our videos was shared by the owner and allowed for use or we purchased. These videos are made as a montage, consist of fragments from several different LoL matches. The content displayed in the video is recorded within the game, If any owner of clips, used in our compilation, has a copyright issue, feel free to contact us by gmail . We will remove the clip, video or come to an agreement. Thank you.
Using or sharing our compilations is allowed, so feel free to share it anywhere, but it would be nice, to use direct link of video, not of copies.
Thanks !
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All videos are not intended to infringe any copyright law, only to assist commentary and recommendation.
If any producer or label has an issue with any of the uploads please get in contact (pikalu@zoho.eu) with me and I will delete it immediately (this includes artists of the images used).
資料Credits連結:
https://docs.google.com/document/d/1tJeEFOSFG9geTlRUBIcZuKhEWplBwJGkNJb-mXHcd_k/edit
BGM:
🎵Persona 5 OST - Price
🎵No More What Ifs instrumental version Persona 5 Royal
00:00 開頭
01:26 世紀帝國4
03:10 密特羅德 生存恐懼
04:28 奇納：靈魂之橋
06:06 破曉傳奇
07:33 死亡循環
08:41 戰地風雲2042
10:10 極地戰嚎6
11:17 喋血復仇
12:33 垂死之光2
14:12 鬼線：東京
14:30 真・女神轉生V
15:10 審判之眼 湮滅的記憶
15:40 第一名?
#戰地風雲2042 #期待遊戲 #卡比嚕 #皮卡大排行 #PikaLu
皮卡大排行 遊戲介紹 聊Game 遊戲排行 2021 地平線 PC 地平線 西方禁地
垂死之光2 喋血復仇 世紀帝國4 真女神轉生5 鬼線：東京 審判之眼 湮滅的記憶 極地戰嚎6 戰地風雲 2042 死亡循環 DEATHLOOP 破曉傳奇 奇納：靈魂之橋 密特羅德：生存恐懼 銀河戰士 SWITCH PS4 PS5 遊戲10大排行 十大排行 Top 10
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喜欢的话，记得订阅按赞然都打开小铃铛
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no issue 在 【為什麼有no problem卻沒有no issue？】... - 英語島English ... 的推薦與評價
為什麼有no problem卻沒有no issue？】 Problem, Trouble跟Issue的區別到底是什麼？ Problem: 能夠解決的、有具體辦法的用problem，如果你是手受傷，你不會說那受傷的 ... ... <看更多>