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We live in a technology-driven world nowadays and as much as we’d like to keep our kids at close watch all the time, it’s practically impossible to watch over their shoulders every time they connect to the Internet. As such, extra measures must be taken to make sure they stay safe whenever they surf the World Wide Web. Here are some tips to start things off:...
https://lemon-film.com/3-proven-tips-to-keep-your-kids-safe-on-the-internet/
Today's haul is this wireless portable car vacuum cleaner that I got from @shopee_my
It comes in black, white and green.
It was on sale at RM41.90 (NP: RM169.90) and I paid RM33.43 from using voucher and coins 🙃
Fully charge maybe needs 3-4 hours but I charge it for awhile for a test for this video. It can clean most small items on this grill rail (yeah instead of using brush to dig em all out even if it's economical). This does exactly what it should. Don't expect it to be working like heavy duty vacuum cleaner though.
Convenient and easy to use (easy to clean too).
I was checking the page for another unit but sold out. I'll share the link here in case you wanna find the same unit/brand 👌🏼
https://shopee.com.my/product/41846947/9344452751?smtt=0.9012856-1632717282.9
Thanks for watching 😘
#productreview #shopeehaul #shopeemy #wirelessvacuumcleaner #reels #reelsofinstagram #newonreel
📜 [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
《Walpurgis》
wonderland / 僅屬兩人的仙境
作詞 / Lyricist：梶浦由記
作曲 / Composer：梶浦由記
編曲 / Arranger：梶浦由記
歌 / Singer：Aimer
翻譯：CH（CH Music Channel）
意譯：CH（CH Music Channel）
English Translation: thisisars
背景 / Background - ひとば - 標本:
https://www.pixiv.net/artworks/82963977
上傳你的字幕吧！/ Submit your subtitles here!
https://forms.gle/MSsAM2WHpT31UuUh8
版權聲明:
本頻道不握有任何音樂所有權，亦無任何營利，一切僅為推廣用途。音樂所有權歸原始創作者所有。請支持正版。
Copyright Info:
Be aware this channel is for promotion purposes only without any illegal profit. All music's ownership belongs to the original creators.
Please support the original creator.
すべての権利は正当な所有者/作成者に帰属します。あなたがこの音楽（または画像）の作成者で、この動画に使用されたくない場合はメッセージまたはこのYoutubeチャンネルの概要のメールアドレスにご連絡ください。私はすぐに削除します。
如果你喜歡我的影片，不妨按下喜歡和訂閱，你的支持就是我創作的最大原動力！
If you like my videos, please click like and subscribe! Thx :)
粉絲團隨時獲得最新訊息！
Check my Facebook page for more information!
https://www.facebook.com/chschannel/
中文翻譯 / Chinese Translation :
https://home.gamer.com.tw/creationDetail.php?sn=5269021
英文翻譯 / English Translation :
https://genius.com/Genius-english-translations-aimer-wonderland-english-translation-lyrics
日文歌詞 / Japanese Lyrics :
迷いの森にあるほんとう 探しに行く月のひかり
羊歯を踏んで足を濡らして ひたりほとり夏の小道
よく笑って泣いて見つめあって おそるおそる恋に堕ちた
ふたり歩き出した違う方へ 呼び合う声だけもどかしく
find me in the wonderland
そろそろ手を汚して 自分の欲しいものを 追いかけてみる
みつあみをほどいて 同じ星を齧る ふたりになる
寂しがって夜になって まだ明るい夢のほとり
食べかけで残した心だって ここから始まるうたになる
世界は君のものさ、どこへ行こうか、貴方は笑う
踏み外してみようか、後ろめたさが私を誘う
find me in the wonderland
どうしたって 生まれ変わるほどの 強い意志が必要だわ
慎重ないのちだった 私だけじゃ道は見つからない
星を数え繋ぎ合わせ まだ知らない夏の星座
見つめあって泣いて朝になって ここから始まる物語
もう一人じゃないのよ、夢のようでしょ、私は歌う
寂しさはひるがえり旗の元へと二人は集う
何も思い通りにならないことが始まったから
踏み外してみようか、目隠し鬼の手の鳴る方へ
in your wonderland
あなたが迷う場所に あかりを灯すために
花束一つ抱いて りりしく笑いましょう
もう一人じゃないのよ、とても怖いね、幸せなんて
寂しさはひるがえり旗の元へと二人は集う
世界は君のものさ、手が届いてあなたがいて
踏み外してみようか、愛するひとが私を誘う
find me in the wonderland
in your wonderland
綺麗な吐息になって
あなたの歌をうたって
中文歌詞 / Chinese Lyrics :
皎潔的月光為我照亮此行、於迷幻之森捕獵真心
踩踏著草蕨、潤濕了雙足，行於令人陶醉的夏日小徑岸邊
曾互相歡笑、哭泣、注視彼此，才使得我們惶恐地墜入愛戀
卻漸漸步入相異路途，竟連呼喊之聲都令人無比焦躁
請步入仙境尋覓迷失的我吧
雙手漸漸開始沾染污穢，試著放縱自身索求慾望
解開扎起的髮辮，成為共食星斗的戀人，相濡以沫
寂寞的心、鋪張的夜色，仍遊走於璀璨的夢的畔邊
早已被啃咬殘缺的心，將自此幻化為歌謠
「你已擁有了全世界，我們要去哪呢？」你莞爾而笑
「要不試著背離正道呢？」罪惡感正如此略誘著我
請步入仙境尋覓孤單的我吧
尚須一份不論如何都欲潰爛重生的強烈意志
曾嚴謹拘束的生命，卻僅自身無法尋見方向
細數繁星、相相連繫，嘗試探尋尚不知悉的夏季星座
彼此相視而泣直至天明，兩人的故事自此展開
「我已不再孤身一人，就彷彿夢一般對吧？」我唱著
寂寥的心隨風飄揚，使彼此相遇於同面旗下
乃因不如己意才使得兩人的生命交織展開
不妨背離正道、作個矇眼鬼循向掌鳴之處
步向有你所處的仙境
僅為了在你迷失之地，綻亮一絲光芒
我將為此獻上花束，兩人一同凜然而笑吧
「我已不再孤身一人，但這份幸福仍會讓人感到恐懼吧？」
寂寥的心隨風飄揚，使彼此相遇於同面旗下
「你已擁有了全世界。」向著觸手可及的你說著
「要不試著背離正道呢？」心愛之人如此略誘著我
請步入仙境尋覓重生的我吧
在那僅有兩人的仙境
化作絢麗的吐息
唱著屬於你的歌謠
英文歌詞 / English Lyrics :
Within a forest of delusion, I search for truth
The light of the moon illuminating my hunt
I step over ferns, my feet becoming wet
The water puddling on the edge of a summer path
Having shared laughter, tears, and gazes between us
Warily, cautiously, I fell in love
Along the separate paths the two of us walked
Is vexingly, only the sound of our voices calling to each other
Find me in the wonderland
Before long, my hands grow dirty
As I chase after that which my self desirеs
My braid becoming undone
We bitе down into the same star, and become a pair
A lonesome, solitary night arrives
The shore of dreams still brightly lit
A heart is left half-eaten and tossed aside
From here forth begins a transformation into song
This world is your plaything, and wherever I go
You are there, laughing
Should I try and step off the path, the unease shall beckon to me
Find me in the wonderland
Even if I must be reborn anew
I cannot go on without a strong, unshakeable will
My life has been a cautious, prudent one
And thus, only I am unable to find a path
Counting the stars, connecting them together
Into an as-yet-unknown summer constellation
Gazing at each other, I cry, and morning comes
From here forth begins a story
I'm no longer on my own, aren't I? Isn't this like a dream? I sing
Desolation flutters in the wind, and we meet at the base of its flag
Since nothing is beginning to go as I had expected
I shall try and step off the path, to the source of the hunter's clap
In your wonderland
For the sake of kindling a light in the place you wander, lost
You held a bouquet in your arms, chivalrously, let's have a laugh
I'm no longer on my own
It is incredibly frightening, about happiness
Desolation flutters in the wind, and we meet at the base of its flag
This world belongs to you, I reach out my hand and you are there
As I step off of the path, my beloved beckons to me
Find me in the wonderland
In your wonderland
Becoming a beautiful breath
Singing a song about you
■ 更多林子安：
INSTAGRAM：https://www.instagram.com/an__official/
FACEBOOK：https://www.facebook.com/Anviolin/
WEIBO：http://weibo.com/u/6511795600
Spotify：https://spoti.fi/2XmfcLw
各式工作演出邀約請私訊IG或臉書專頁
For business, please send private message to my Instagram or Facebook fan page.
■ 更多【Cover by AnViolin】：https://bit.ly/2vWVtF5
🎶樂譜連結 Sheet Music🎶
https://anviolin.gumroad.com/l/xpXyH
（台灣請用蝦皮）https://shopee.tw/product/260436562/13115672076?smtt=0.260438387-1632481831.9
--
許美靜《城裡的月光》小提琴版本
| Violin cover by Lin Tzu An of Moonlight in the City by Mavis Hee
這首每年中秋節的應景歌曲，非常經典～～迎接中秋來臨，我也來蹭一波月光！
清亮而溫柔的旋律充滿著當時情歌的溫柔，細膩勾畫出互相牽掛的心情，多一分太膩，少一分又不夠味道，雖然歌曲本身充滿著淡淡憂愁，也有著希望與祝福。
忘記從哪邊閱讀到，月亮是死亡的天體，月亮告訴我們，空氣和水都已經離開的星球會是什麼樣子，可是即使這樣，月亮也同時成為一些人的光，想想就覺得月亮真是美麗又悲傷。
常常看著月亮發呆，就會覺得即使無法擁有白天也沒關係，即便生命中很多時間都是黑夜，有時甚至忘記為自己開燈，但月亮一直都在：）
然後月餅也一直都會有啦，大家不要月圓人更圓喔🌝
信義區香堤大道街頭演出變成登記制了，想聽我live版演出相關資訊，請追蹤Instagram限時動態！
--
Here comes newww cover song. It's a classic one for moon festival !!!
Enjoy my cover song and moon cakes (if any)
Enjoy every moment at night with moon there for you always=]
Should you have any request regarding cover songs, just comment below and let me know.
Also please share the video and subscribe to my channel https://bit.ly/2EsTGMQ.
Don't forget to click the 🔔 bell to be notified when my videos come out!
Visit me at Taipei Shin Kong Mitsukoshi Xinyi Plaza to enjoy more my live cover songs. Check it out details on my Instagram stories!
--
編曲Arrange：林子安 Lin Tzu An
混音mix：林子安 Lin Tzu An
小提琴 Violin: 林子安 Lin Tzu An
攝影師剪接師 Photographer & Film editor: Santon.W
文字編輯 Social media editor/manager: Lily Wu
--
🎻Sponsor AnViolin🎻
如果你喜歡我的影片的話，歡迎贊助我，讓我有更多資源去提升畫面與音樂。
贊助連結：
（台灣請用歐付寶）歐付寶：https://p.opay.tw/77sBF
（Via Paypal）Sponsorship：https://www.paypal.me/Anviolin
--
【Cover by AnViolin】每週上傳新的小提琴cover影片，
喜歡的話請訂閱我的頻道 https://bit.ly/2EsTGMQ
也記得開啟🔔訂閱通知，按讚留言分享給你家人朋友看！
還想看子安cover什麼歌？留言跟我說 ！
--
#許美靜
#城裡的月光
#AnViolin
#Moonlightviolin
#CoverSong
#ViolinCover
#CoverByAn
#林子安
#林子安小提琴
■ 更多林子安：
INSTAGRAM：https://www.instagram.com/an__official/
FACEBOOK：https://www.facebook.com/Anviolin/
WEIBO：http://weibo.com/u/6511795600
Spotify：https://spoti.fi/2XmfcLw
各式工作演出邀約請私訊IG或臉書專頁
For business, please send private message to my Instagram or Facebook fan page.
■ 更多【Cover by AnViolin】：https://bit.ly/2vWVtF5
🎶樂譜連結 Sheet Music🎶
https://gumroad.com/anviolin
（台灣請用蝦皮）https://shopee.tw/anviolin
--
人生無限傳奇只相信五月天的經典串燒 | picks of Mayday Medley
雖然大家不一定是五迷，但各位長大的路上，一直都有五月天的歌陪著吧
誰能相信五月天的阿信跟翁立友都已經45歲了呢（兩位表示躺著也中槍XD）
相信每一個人的每個階段都有一首陪著我們笑過哭過愛過的五月天❤️
我們選出的歌曲中，有沒有讓各種陷入人生無限回憶呢？
串燒歌曲標記時間軸就沒有驚喜了，希望大家會喜歡我們這次的合作！
信義區香堤大道街頭演出變成登記制了，想聽我live版演出相關資訊，請追蹤Instagram限時動態！
--
Here comes to my collaboration with @張育瑞 Rick Chang for this Mayday Medley !
Tho not all of you are fans of Mayday, our young time must related to their songs.
So Rick and I decided to take ya'll back through the memories of 20 years in 8 mins.
Enjoy our collaboration😄
Should you have any request regarding cover songs, just comment below and let me know.
Also please share the video and subscribe to my channel https://bit.ly/2EsTGMQ.
Don't forget to click the 🔔 bell to be notified when my videos come out!
Visit me at Taipei Shin Kong Mitsukoshi Xinyi Plaza to enjoy more my live cover songs. Check it out details on my Instagram stories!
--
編曲Arrange：林子安 Lin Tzu An、張育瑞
混音mix：林子安 Lin Tzu An
小提琴 Violin: 林子安 Lin Tzu An
鍵盤keyboard :張育瑞
攝影師剪接師 Photographer & Film editor: Santon.W
文字編輯 Social media editor/manager: Lily Wu
--
🎻Sponsor AnViolin🎻
如果你喜歡我的影片的話，歡迎贊助我，讓我有更多資源去提升畫面與音樂。
贊助連結：
（台灣請用歐付寶）歐付寶：https://p.opay.tw/77sBF
（Via Paypal）Sponsorship：https://www.paypal.me/Anviolin
--
【Cover by AnViolin】每週上傳新的小提琴cover影片，
喜歡的話請訂閱我的頻道 https://bit.ly/2EsTGMQ
也記得開啟🔔訂閱通知，按讚留言分享給你家人朋友看！
還想看子安cover什麼歌？留言跟我說 ！
--
#五月天串燒
#華語經典
#MaydayMedley
#AnViolin
#CoverSong
#ViolinCover
#CoverByAn
#林子安
#林子安小提琴
You Should Be Here 大家身邊應該都有朋友有加入吧???好像是個旅遊直銷好像有許多國內外名人藝人都有加入我有朋友加入看他一年出國了5次好像都不用錢 ... ... <看更多>
you should be here 在 U should be here - Home | Facebook 的推薦與評價
U should be here. 69 likes. yoU should be here ! welcome you to join our travel club! 你應該在這裡！ 歡迎您加入我們的旅遊俱樂部！ ... <看更多>