Hey! Ever since I graduated and started working in KL, I always wish to have my own place. But owning a property in the city centre is like next to never or just a dream. ✨✨
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Check out more info and the Top 7 Reasons Why Astrum Ampang is Ideal for Young Adults on my blog (link in the comment box)
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Xavier Mah Consultancy #astrumampang #setiaawan #xmconsultancy #sohotransit #ampang #soho #kl #igmy #kellylifestyle
同時也有48部Youtube影片,追蹤數超過110萬的網紅Rachel & Jun's Adventures!,也在其Youtube影片中提到,d:matcha online store: https://dmatcha.com/collections Tea-business-school: https://dmatcha.com/pages/tea-business-school Internship: https://dmatc...
「i can only imagine」的推薦目錄:
- 關於i can only imagine 在 Facebook 的最讚貼文
- 關於i can only imagine 在 Taipei Ethereum Meetup Facebook 的最佳貼文
- 關於i can only imagine 在 全聯建築技術機構 -許偉揚.瓦建設計 Facebook 的最讚貼文
- 關於i can only imagine 在 Rachel & Jun's Adventures! Youtube 的最佳解答
- 關於i can only imagine 在 Hashimoto Shun Youtube 的最讚貼文
- 關於i can only imagine 在 官方頻道小賴 Youtube 的最佳貼文
- 關於i can only imagine 在 I Can Only Imagine (with lyrics) - MercyMe - YouTube 的評價
- 關於i can only imagine 在 J. Michael Finley - I can only Imagine - YouTube 的評價
- 關於i can only imagine 在 I Can Only Imagine ft. Chris Brown, Lil Wayne (Official Video) 的評價
- 關於i can only imagine 在 I Can Only Imagine - Home | Facebook 的評價
i can only imagine 在 Taipei Ethereum Meetup Facebook 的最佳貼文
📜 [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
i can only imagine 在 全聯建築技術機構 -許偉揚.瓦建設計 Facebook 的最讚貼文
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
i can only imagine 在 Rachel & Jun's Adventures! Youtube 的最佳解答
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Thank you to the government of Kyoto and d:matcha for sponsoring our trip to Wazuka! We learned a ton of things about green tea that we never knew. Most surprisingly to us was finding out how extremely varied the flavor of green tea (100% JUST green tea) can be based on how it's grown and processed. Since our trip we've been constantly drinking umami green tea and we can't imagine our lives without it!! If you have a chance when visiting Japan, I highly recommend visiting d:matcha, not just for the experience of tasting mindblowingly good green tea, but also because their tea and matcha desserts and snacks are delicious! Oh, and the area is of course beautiful, as well!
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![post-title](https://i.ytimg.com/vi/F5A21lrIEBI/hqdefault.jpg)
i can only imagine 在 Hashimoto Shun Youtube 的最讚貼文
I translated it with my own interpretation.
My first cover with playing the piano.
Imagine there's no Heaven
It's easy if you try
No Hell below us
Above us only sky
Imagine all the people
Living for today...
Imagine there's no countries
It isn't hard to do
Nothing to kill or die for
And no religion too
Imagine all the people
Living life in peace
You may say I'm a dreamer
But I'm not the only one
I hope someday you'll join us
And the world will be as one
Imagine no possessions
I wonder if you can
No need for greed or hunger
A brotherhood of man
Imagine all the people
Sharing all the world
You may say I'm a dreamer
But I'm not the only one
I hope someday you'll join us
And the world will live as one
Twitter:https://twitter.com/Sh__gtm
#Imagine #JohnLennon #piano
![post-title](https://i.ytimg.com/vi/h9sveMbij9U/hqdefault.jpg)
i can only imagine 在 官方頻道小賴 Youtube 的最佳貼文
「你敢在家人面前,牽起我的手嗎?」
繼「下次我會把你抓緊」之後 最虐心的情歌 「魚水深情」
記得先去看 下次我會把你抓緊的MV
KK Box:► https://kkbox.fm/Xa6U2P
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.Song Lyrics.
詞曲:田亞霍
編曲:高維綸
秋風吹散 落葉
Autumn leaves are swirling in the wind
皎潔月光灑滿 了街
The street is bright in the moonlight
我的心思只有你能 破解
You're the only one who understands my heart
回憶譬如 昨夜
These memories just don't seem real
像那金牛照亮 摩羯
Like how Capricorn is attracted to Taurus
再也找不到 誰能讓我 糾結
I can never find someone who makes my heart flutter
故事還能有 多遠
Is there an end to our love story?
我們究竟會不會有 終點
Is it time for us to let go?
你的身影一直在我心裡 流連
You are always going to be in my heart
思念它不肯 收斂
I can't let go of the past
早已將脆弱的我 攻陷
Because you have made my heart melt
在內心深處早已刻下你的 容顏
Your impression has deeply imprinted in my heart
為了要愛上你親吻你 得到你
I want to love you, kiss you, and be with you
所以才擁抱你 的倒影
So I imagine you right next to me
是什麼 機遇 要多少 機率
What are the chances that I meet you
才能夠有這樣的 幸運
Only if I am lucky enough
為了要愛上你親吻你 得到你
I want to love you, kiss you, and be with you
所以才追隨你 的腳印
So I trace your footprints
盼某日魚水深情
Hoping you to fall deeply in love with me
故事還能有 多遠
Is there an end to our love story?
我們究竟會不會有 終點
Is it time for us to let go?
你的身影一直在我心裡 流連
You are always going to be in my heart
思念它不肯 收斂
I can't let go of the past
早已將脆弱的我 攻陷
Because you have made my heart melt
在內心深處早已刻下你的 容顏
Your impression has deeply imprinted in my heart
為了要愛上你親吻你 得到你
I want to love you, kiss you, and be with you
所以才擁抱你 的倒影
So I imagine you right next to me
是什麼 機遇 要多少 機率
What are the chances that I meet you
才能夠有這樣的 幸運
Only if I am lucky enough
為了要愛上你親吻你 得到你
I want to love you, kiss you, and be with you
所以才追隨你 的腳印
So I trace your footprints
盼某日魚水深情
Hoping you to fall deeply in love with me
#魚水深情 #賴晏駒 #下次我會把你抓緊
![post-title](https://i.ytimg.com/vi/vqfJuKndX_Y/hqdefault.jpg)
i can only imagine 在 I Can Only Imagine ft. Chris Brown, Lil Wayne (Official Video) 的推薦與評價
![影片讀取中](/images/youtube.png)
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i can only imagine 在 I Can Only Imagine (with lyrics) - MercyMe - YouTube 的推薦與評價
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