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Fastest way to check if a string matches a regexp in ruby?
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Starting with Ruby 2.4.0, you may use RegExp#match?:
pattern.match?(string)
Regexp#match? is explicitly listed as a performance enhancement in the release notes for 2.4.0, as it avoids object allocations performed by other methods such as Re...
How to know if two arrays have the same values
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23 Answers
23
Active
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Are list-comprehensions and functional functions faster than “for loops”?
...D_FAST 0 (.0)
>> 6 FOR_ITER 12 (to 21)
9 STORE_FAST 1 (x)
12 LOAD_FAST 1 (x)
15 LIST_APPEND 2
18 JUMP_ABSOLUTE 6
>> 21 RETURN_VALUE
Usi...
C#位运算符（C#按位与、按位或 等） - 更多技术 - 清泛网 - 专注C/C++及内核技术
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1
~a
&
位逻辑与运算
2
a & b
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位逻辑或运算
2
a | b
^
位逻辑异或运算
2
a ^ b
<<
位左移运算
2
a<<4
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Calculate distance between 2 GPS coordinates
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29 Answers
29
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How to slice an array in Bash
...n section in the Bash man page. A[@] returns the contents of the array, :1:2 takes a slice of length 2, starting at index 1.
A=( foo bar "a b c" 42 )
B=("${A[@]:1:2}")
C=("${A[@]:1}") # slice to the end of the array
echo "${B[@]}" # bar a b c
echo "${B[1]}" # a b c
echo "${C...
How do I convert an integer to binary in JavaScript?
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526
function dec2bin(dec){
return (dec >>> 0).toString(2);
}
dec2bin(1); // 1
dec2...
Find indices of elements equal to zero in a NumPy array
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228
numpy.where() is my favorite.
>>> x = numpy.array([1,0,2,0,3,0,4,5,6,7,8])
>>&...
Generate all permutations of a list without adjacent equal elements
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12 Answers
12
Active
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Converting bytes to megabytes
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Traditionally by megabyte we mean your second option -- 1 megabyte = 220 bytes. But it is not correct actually because mega means 1 000 000. There is a new standard name for 220 bytes, it is mebibyte (http://en.wikipedia.org/wiki/Mebibyte) and it gathers popularity.
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