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What are the underlying data structures used for Redis?
... dynamic string library so that we don't pay (asymptotically speaking) for allocations in append operations. This way we have O(N) appends, for instance, instead of having quadratic behavior.
Lists are implemented with linked lists.
Sets and Hashes are implemented with hash tables.
Sorted sets are i...
How to explain callbacks in plain english? How are they different from calling one function from ano
...ich would be processed in the process of another function. For example in PHP array_filter() and array_map() take callbacks to be called in a loop.
– Haralan Dobrev
Mar 13 '12 at 23:33
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CDN（内容分发网络）技术原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...功能，所以大部分网页对象（Web page object），如html, htm, php等页面文件，gif,tif, png, bmp等图片文件，以及其他格式的文件，在有效期（TTL）内，对于重复的访问，不必从原始网站重新传送文件实体，只需通过简单的认证（Freshness V...
What's the difference between equal?, eql?, ===, and ==?
...
You might be familiar with === as an equality operator in Javascript and PHP, but this just not an equality operator in Ruby and has fundamentally different semantics.
So what does === do?
=== is the pattern matching operator!
=== matches regular expressions
=== checks range membership
=== che...
Is there a list of screen resolutions for all Android based phones and tablets? [closed]
...arsed list of screens:
From http://www.emirweb.com/ScreenDeviceStatistics.php
####################################################################################################
# Filter out same-sized same-dp screens and width/height swap.
#####################################################...
How to implement classic sorting algorithms in modern C++?
...ion to sort; their difference will tell the size of the array of counts to allocate. Then, a second pass through the collection is done to count the number of occurrences of every element. Finally, we write back the required number of every integer back to the original collection.
template<type...
Xamarin 2.0 vs Appcelerator Titanium vs PhoneGap [duplicate]
...indows Phone. Titanium actually has more in common with MacRuby/Hot Cocoa, PHP, or node.js than it does with PhoneGap, Adobe AIR, Corona, or Rhomobile. Titanium is built on two assertions about mobile development:
- There is a core of mobile development APIs which can be normalized across platforms...
Should I use Vagrant or Docker for creating an isolated environment? [closed]
... application in a wide variety of envionment configs (different databases, php versions, caching backends etc), then I can easily do that with docker containers. But I cant see if my application will run properly in a windows IIS env, or on BSD or OSX.
– Mixologic
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data.table vs dplyr: can one do something well the other can't or does poorly?
...z=sum(z) * mul), by = .EACHI]
What is the advantage?
We don't have to allocate memory for the intermediate result.
We don't have to group/hash twice (one for aggregation and other for joining).
And more importantly, the operation what we wanted to perform is clear by looking at j in (2).
Chec...
What does f+++++++++ mean in rsync logs?
... you paste some examples?
EDIT: As per http://ubuntuforums.org/showthread.php?t=1342171 those codes are defined in the rsync man page in section for the the -i, --itemize-changes option.
Fixed part if my answer based on Joao's
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