Tag: logic

五家公司提出 Form S-1：Asana、Unity、Snowflake、sumo logic、JFrog

在 Hacker News 上看到五家公司都準備要上市而丟出 Form S-1 的情況頗熱鬧的，申請文件可以在「ASANA, INC. (d855753ds1.htm)」、「UNITY SOFTWARE INC. (d908875ds1.htm)」、「Snowflake Inc. (snowflakes-1.htm)」、「Sumo Logic, Inc. (d821436ds1.htm)」與「JFrog Ltd. (d841831ds1.htm)」這邊翻到。

當然很多人都有類似的疑問，就是為什麼大家突然都急著要 IPO，在「Ask HN: There are 5 S-1 posts on the front page, what explains the rush?」這邊有些討論，而且也提到了一些有趣的現象，像是這五家公司到目前都是虧錢的，不過這已經是這幾年的常態了，倒是沒什麼需要大驚小怪的：

Asana lost 120m last year
Snowflake lost 350m last year
Unity lost 160m last year
Sumo Logic lost 43m last year
Jfrog lost 400k last year

Out of curiosity, is it normal for companies to IPO this far away from profitability, or is this a recent tech thing? I feel like it was a big deal when uber IPO'd so far away from profitability, now it seems standard.

有人猜測跟美國選舉有關，不過也就只有帶出來猜測...

用程式解數學邏輯問題...

在 Hacker News Daily 上看到的數學邏輯問題：「“Which answer in this list is the correct answer to this question?”」。

問題是這樣：

Which answer in this list is the correct answer to this question?

  • All of the below.
  • None of the below.
  • All of the above.
  • One of the above.
  • None of the above.
  • None of the above.

accepted 的那個是推演的答案，但最高分的那個是寫程式窮舉 XDDD (不得不說大家都很愛這味...)

AWS WAF 提供隨時更新的 Managed Rules

AWS WAF 推出了隨時更新的 Managed Rule：「Ready-to-Use Managed Rules Now Available on AWS WAF」。

這些 ruleset 是由 3rd-party 提供的：

Choose from preconfigured RuleGroups provided in the AWS Marketplace by industry leading security experts: Alert Logic, Fortinet, Imperva, Trend Micro and TrustWave.

然後隨時更新：

Rules are automatically updated as new threats emerge and offer a wide range of protections, including OWASP Top 10 mitigations, bad-bot defenses, and virtual patching against recent CVE’s.

然後是要收費的：

Each RuleGroup is the product of a Seller’s unique expertise, made available to you at an affordable pay-as-you-go price.

在 AWS Marketplace 的「Managed Rules for AWS WAF - Web Application Firewall」裡拿兩家來看看。

趨勢的「Trend Micro Managed Rules for AWS WAF - WebServer (Apache, Nginx)」與「Trend Micro Managed Rules for AWS WAF - Content Management System (CMS)」都是：

Charge per month in each available region (pro-rated by the hour) $5.00 / unit
Charge per million requests in each available region $0.20 / unit

而 Imperva 則是提供不一樣的選擇，在「Imperva - Managed Rules for WordPress Protection on AWS WAF」是：

Charge per month in each available region (pro-rated by the hour) $30.00 / unit
Charge per million requests in each available region $0.60 / unit

而「Imperva - Managed Rules for IP Reputation on AWS WAF」則是：

Charge per month in each available region (pro-rated by the hour) $40.00 / unit
Charge per million requests in each available region $0.40 / unit