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Get index of array element faster than O(n)
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edited Feb 13 '13 at 0:37
answered Jun 5 '11 at 10:41
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undefined method `source_index' for Gem:Module (NoMethodError)
I'm running a Rails 2.3.5 application and upon running script/server I am shown the following:
5 Answers
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Define preprocessor macro through CMake?
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3 Answers
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Active
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What is the difference between HTTP status code 200 (cache) vs status code 304?
... cached objects were still stored in local cache and had not yet expired.
304s, on the other hand, are the response of the server after the browser has checked if a file was modified since the last version it had cached (the answer being "no").
For most optimal web performance, you're best off set...
Why does CSS work with fake elements?
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edited Jun 3 '14 at 15:09
BoltClock♦
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LINQ where vs takewhile
...d find all elements matching the condition
var intList = new int[] { 1, 2, 3, 4, 5, -1, -2 };
Console.WriteLine("Where");
foreach (var i in intList.Where(x => x <= 3))
Console.WriteLine(i);
Console.WriteLine("TakeWhile");
foreach (var i in intList.TakeWhile(x => x <= 3))
Console....
Difference between '..' (double-dot) and '…' (triple-dot) in range generation?
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edited Dec 21 '16 at 0:33
answered Mar 13 '12 at 19:48
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App Inventor 2 数学积木的9个隐藏用法：随机种子、位运算、取整陷阱，踩中...
基础篇（1-3条）
技巧1：进制数字块直接写二进制和十六进制
别再用十进制再手动转换了。数字块本身就支持 0b 前缀写二进制、0x 前缀写十六进制、0o 前缀写八进制。比如 0b1010 直接就是 10，0xFF 就是 255。
更方便的是「...
Base64: What is the worst possible increase in space usage?
...the size of the base-64 representation of a string of size n is:
ceil(n / 3) * 4
So, for a 16kB array, the base-64 representation will be ceil(16*1024/3)*4 = 21848 bytes long ~= 21.8kB.
A rough approximation would be that the size of the data is increased to 4/3 of the original.
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