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[爆卦]gas教學是什麼？優點缺點精華區懶人包

雖然這篇gas教學鄉民發文沒有被收入到精華區：在gas教學這個話題中，我們另外找到其它相關的精選爆讚文章

在 gas教學產品中有68篇Facebook貼文，粉絲數超過3,460的網紅Taipei Ethereum Meetup，也在其Facebook貼文中提到， 📜 [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 r...

　同時也有126部Youtube影片，追蹤數超過14萬的網紅李哈利Harry，也在其Youtube影片中提到，有個即將上市的 NFT 項目，竟然是買到賺到？！🤑🤑 在差不多一個月之前，我偶然發現到一個還在準備中的 NFT 項目，叫做 MekaVerse。 這個項目當時才剛剛開始，只是在網絡上發佈了一個關於這個項目的短片，就吸引了上千人加入了他們的 discord 群組，讓 discord 會員暴增至 8...

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gas教學 在 康妮英文ConniedaEnglish Instagram 的最佳貼文

2021-05-30 11:31:25

短期內只會用in short time嗎？ 來學學這些道地的 “短期內” 講法～ 記得滑到圖片開聲音聽例句🗣, ⬇️ 實用的話記得按讚&收藏起來 ⬇️ ▫️ not …. anytime soon ⚠️只照字面上的意思, 大家會覺得是指”近期”不會發生, 但其實這有點在暗示應該”不太會”發...

gas教學 在 Gary ?? 英文老師 (小籠包老師) Instagram 的精選貼文

2021-07-11 09:39:57

✅ Vocabulary 單字：⁠ 【Car Fob 】 an electronic device connected to a key that is used to lock and unlock a car's doors; 汽車遙控⁠ 【Ignition Key】the key used i...

gas教學 在 DSE 7科5** | IELTS 9分 | 線上補習 Instagram 的最讚貼文

2020-11-02 11:19:01

1. What are the possible sources of error? a. friction between the plunger and the gas syringe b. leakage of gas between the junctions c. heat given o...

  • Taipei Ethereum Meetup

    gas教學 在 Taipei Ethereum Meetup Facebook 的最讚貼文

    2021-09-23 21:53:53
    有 6 人按讚

    📜 [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

  • 經理人月刊MANAGERtoday

    gas教學 在 經理人月刊MANAGERtoday Facebook 的最讚貼文

    2021-09-21 10:00:46
    有 19 人按讚

    一場成功的會議簡報，是讓團隊信服你的關鍵！
    開會要能有效溝通，先從搞懂需求、對準問題開始。

    【10/26簡報攻心術】一堂專業經理人必學的說話課
    #線上直播教學🎥 前往學習 >> https://bit.ly/2XtpPQZ

    上完這堂直播課你將學到？
    🎯 簡報策略｜對準「聽眾」與「目的」設計一份說服型簡報
    🎯 精準溝通｜掌握GAS口語魅力法，一開口就建立好感度

    聽說講師教學有趣、互動無冷場？
    ✔ 超過2000場企業團訓專業講師｜楊紹強
    ✔ 榮獲7次金鐘獎肯定資深媒體人｜王介安

  • 數位時代

    gas教學 在 數位時代 Facebook 的最佳貼文

    2021-09-16 13:52:02
    有 1 人按讚

    美國調查顯示，只有不到三成的專業經理人能做好精準溝通！
    對準問題、說出重點、成功說服，學會4大簡報關鍵，讓你在職場上脫穎而出！

    【線上直播】10/26 #簡報攻心術
    早鳥搶先卡位🔥https://bit.ly/2Xg2XnE

    上完這堂直播課你將學到？
    🎯 簡報策略｜對準「聽眾」與「目的」設計一份說服型簡報
    🎯 精準溝通｜掌握GAS口語魅力法，一開口就建立好感度

    聽說講師教學有趣、互動無冷場？
    ✔ 超過2000場企業團訓專業講師｜楊紹強
    ✔ 榮獲7次金鐘獎肯定資深媒體人｜王介安

    #有網路在哪都能上課
    #專業直播團隊把關課程品質

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