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How to merge two arrays in JavaScript and de-duplicate items
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answered Oct 18 '09 at 8:42
LiraNunaLiraNuna
54.1k1313 gold badges110110 silver badges135135 bronze badges
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git pull while not in a git directory
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458
Starting git 1.8.5 (Q4 2013), you will be able to "use a Git command, but without having to ch...
Find first element by predicate
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741
No, filter does not scan the whole stream. It's an intermediate operation, which returns a lazy...
Append value to empty vector in R?
...appending for larger vectors.
set.seed(21)
values <- sample(letters, 1e4, TRUE)
vector <- character(0)
# slow
system.time( for (i in 1:length(values)) vector[i] <- values[i] )
# user system elapsed
# 0.340 0.000 0.343
vector <- character(length(values))
# fast(er)
system.time(...
Why are C character literals ints instead of chars?
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answered Apr 23 '14 at 16:04
John VincentJohn Vincent
57155 silver badges44 bronze badges
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了解 Boost Filesystem Library - C/C++ - 清泛网 - 专注C/C++及内核技术
...例程。此代码经过验证，能在不用修改的情况下在 gcc-3.4.4 和 cl-13.10.3077 上成功编译。
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了解 Boost path 对象
了解 Boost Filesystem Library 的关键是 path 对象，因为 Filesystem Library 中定义的多个例程都要对相应的 path 对象操作...
Renaming columns in pandas
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1974
Just assign it to the .columns attribute:
>>> df = pd.DataFrame({'$a':[1,2], '$b': [10,...
How to use if-else option in JSTL
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skaffmanskaffman
374k9292 gold badges779779 silver badges744744 bronze badges
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Why are these constructs using pre and post-increment undefined behavior?
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14 Answers
14
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.toArray(new MyClass[0]) or .toArray(new MyClass[myList.size()])?
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114
Counterintuitively, the fastest version, on Hotspot 8, is:
MyClass[] arr = myList.toArray(new M...