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How to make an immutable object in Python?
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edited May 23 '17 at 12:34
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answered Jan 28 '11 at 13:39
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When to use PNG or JPG in iPhone development?
...ing UIImage:imageFromData when you want to display. The JPG data can be 10-100x smaller than the bitmap image data, but it allows you to get the (relatively slow) IO part out of the way early. Obviously be careful about how much data you cache/preload this way.
– Nigel Flack
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BLE（一）概述&工作流程&常见问题 - 创客硬件开发 - 清泛IT社区，...
...离无线通信，正常运行时传输距离为10m（低功耗模式下为100m），频段2.4Ghz。先进行三个蓝牙术语介绍：
配对:配对是指两个蓝牙设备首次通讯时，相互确认的过程。两个蓝牙设备之间一经配对之后，随后的通讯连接就不必每次...
SQL JOIN - WHERE clause vs. ON clause
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@FistOfFury Sql Server uses a query optimizer procedure that compiles and evaluates your code to produce the best execution plan it can. I...
Postfix发信的频率控制几个参数 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...以将同一封邮件发送给多少个收件人，该参数的缺省值为1000。
4． 推迟投递控制
通过defer_transports参数，我们可以推迟投递该参数指定的邮件直到postfix明确的提出投递要求。下面我们看一个例子：
有一个小型的局域网，用...
C++ preprocessor __VA_ARGS__ number of arguments
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Options for embedding Chromium instead of IE WebBrowser control with WPF/C#
... I finally went with CefSharp and the results were amazing. <100 ms initialization (ie. instant init) and no "bugs". Stuff just works. As it should. Also CefSharp does NOT need to be added into the GAC so no installer changes needed. Just copy your files and go. Did I mention CEF/CefSh...
MySQL - Rows to Columns
...ding the base table. So for 5 or 10 x-values, this solution is nice. For 100, not so nice. There are some solutions with stored procedures generating a query, but they're ugly and difficult to get right. I currently don't know of a good way to solve this problem when the pivot table needs to hav...
How do you get a timestamp in JavaScript?
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To get the timestamp in seconds, you can use:
Math.floor(Date.now() / 1000)
Or alternatively you could use:
Date.now() / 1000 | 0
Which should be slightly faster, but also less readable (also see this answer).
I would recommend using Date.now() (with compatibility shim). It's slightly bet...
Immutability of Strings in Java
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edited Jun 20 at 9:12
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answered Oct 12 '09 at 7:04
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