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Why doesn't GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)?
... community wiki
6 revs, 3 users 86%Lambdageek
10
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Best way to convert an ArrayList to a string
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336
Basically, using a loop to iterate over the ArrayList is the only option:
DO NOT use this cod...
Inline instantiation of a constant List
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3 Answers
3
Active
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Command line CSV viewer? [closed]
...e demonstrates how to use sed to insert a placeholder:
$ cat data.csv
1,2,3,4,5
1,,,,5
$ sed 's/,,/, ,/g;s/,,/, ,/g' data.csv | column -s, -t
1 2 3 4 5
1 5
$ cat data.csv
1,2,3,4,5
1,,,,5
$ column -s, -t < data.csv
1 2 3 4 5
1 5
$ sed 's/,,/, ,/g;s/,,/, ,/g' data.csv | column ...
Quickly find whether a value is present in a C array?
...rt enough to unroll the loop. Here's a way to do it which incorporates the 3 ideas I mentioned in my comment: Loop unrolling, cache prefetch and making use of the multiple load (ldm) instruction. The instruction cycle count comes out to about 3 clocks per array element, but this doesn't take into ac...
JavaScript function to add X months to a date
...addMonths(new Date(2017,0,1),-1).toString());
// Subtract 2 months from 31 Jan 2017 -> 30 Nov 2016
console.log(addMonths(new Date(2017,0,31),-2).toString());
// Add 2 months to 31 Dec 2016 -> 28 Feb 2017
console.log(addMonths(new Date(2016,11,31),2).toString());
The above solu...
What is the most efficient string concatenation method in python?
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John FouhyJohn Fouhy
35.3k1818 gold badges5757 silver badges7373 bronze badges
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Should we pass a shared_ptr by reference or by value?
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237
This question has been discussed and answered by Scott, Andrei and Herb during Ask Us Anything ...
Best way to check if object exists in Entity Framework?
... from a performance point of view? I'm using Entity Framework 1.0 (ASP.NET 3.5 SP1).
8 Answers
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Flatten an Array of Arrays in Swift
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Swift >= 3.0
reduce:
let numbers = [[1,2,3],[4],[5,6,7,8,9]]
let reduced = numbers.reduce([], +)
flatMap:
let numbers = [[1,2,3],[4],[5,6,7,8,9]]
let flattened = numbers.flatMap { $0 }
joined:
let numbers = [[1,2,3],[4],[5,6,7...