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MySQL vs MongoDB 1000 reads
... to perform:
One index lookup on the collection (assuming the entity is fetched by id)
Retrieve the contents of one database page (the actual binary json document)
So a b-tree lookup, and a binary page read. Log(n) + 1 IOs. If the indexes can reside entirely in memory, then 1 IO.
In MySQL with ...
RSA 算法是如何诞生的 - 创意 - 清泛网 - 专注C/C++及内核技术
RSA 算法是如何诞生的最近为了研究某个极其无聊的问题，读了一些公钥加密的历史，意外地发现这段历史竟然非常有趣。尤其是 RSA 算法的诞生过程，被很多书写得...最近为了研究某个极其无聊的问题，读了一些公钥加密的历史...
“Variable” variables in Javascript?
... array could be defined automatically via an input, database query, event, etc.
elements.forEach( (element) => {
elementIds[element] = document.getElementById(element);
});
This example declares variable variables (keys in elementIds) based on the ID of each element,...
What is the difference between the | and || or operators?
... know what that is. It's used in conditional statements such as if, while, etc.
condition1 || condition2
Evaluates to true if either condition1 OR condition2 is true.
| is the bitwise OR operator. It's used to operate on two numbers. You look at each bit of each number individually and, if one o...
O2O江湖:2015大洗牌 2016 BAT等巨头将“肉搏” - 资讯 - 清泛网 - 专注C/C++及内核技术
...。新政一出，不禁让人质疑，这岂不是让本想解决出租车问题的专车沦为跟出租车一样的“二出租”？
移动会议专家创始人余德认为：“拥堵、安全等不是管理专车的遮羞布，牌照制才是出租领域的恶根。放弃既得利益、寻租...
Check if passed argument is file or directory in Bash
...ou won't print any diagnosis for a block special, character special, FIFO, etc? Symlinks probably resolve to what's at the far end of the link; broken symlinks are more problematic.
– Jonathan Leffler
Mar 22 '19 at 15:14
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Enable Vim Syntax Highlighting By Default
... of basic stuff for you automatically (syntax, search highlighting, backup etc). You can then tweak it based on your needs.
– oyenamit
Jun 30 '12 at 14:51
3
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Shortcut to comment out a block of code with sublime text
...
Ctrl-/ will insert // style commenting, for javascript, etc
Ctrl-/ will insert <!-- --> comments for HTML,
Ctrl-/ will insert # comments for Ruby,
..etc
But does not work perfectly on HTML <script> tags.
HTML <script> ..blah.. </script> tags:
Ctrl-/ twice...
How to deploy correctly when using Composer's develop / production switch?
...hat only make sense in development, like tests, fake-data-tools, debugger, etc.
5 Answers
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OOP vs Functional Programming vs Procedural [closed]
...ges were pretty small and easily replicated - C, C++, Assembler, ML, LISP, etc.. came with the basics, but tended to chicken out when it came to standardizing on things like network communications, encryption, graphics, data file formats (including XML), even basic data structures like balanced tree...