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Manipulate a url string by adding GET parameters
...query'
parse_str($url_parts['query'], $params);
} else {
$params = array();
}
$params['category'] = 2; // Overwrite if exists
$params['tags'][] = 'cool'; // Allows multiple values
// Note that this will url_encode all values
$url_parts['query'] = http_build_query($params);
// If you ...
Ruby Arrays: select(), collect(), and map()
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It looks like details is an array of hashes. So item inside of your block will be the whole hash. Therefore, to check the :qty key, you'd do something like the following:
details.select{ |item| item[:qty] != "" }
That will give you all items where th...
What's the fastest way to do a bulk insert into Postgres?
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UNNEST function with arrays can be used along with multirow VALUES syntax. I'm think that this method is slower than using COPY but it is useful to me in work with psycopg and python (python list passed to cursor.execute becomes pg ARRAY):
INSER...
Why use non-member begin and end functions in C++11?
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How do you call .begin() and .end() on a C-array ?
Free-functions allow for more generic programming because they can be added afterwards, on a data-structure you cannot alter.
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How do you do a deep copy of an object in .NET? [duplicate]
...:
using System.Collections.Generic;
using System.Reflection;
using System.ArrayExtensions;
namespace System
{
public static class ObjectExtensions
{
private static readonly MethodInfo CloneMethod = typeof(Object).GetMethod("MemberwiseClone", BindingFlags.NonPublic | BindingFlags.In...
Ruby combining an array into one string
In Ruby is there a way to combine all array elements into one string?
3 Answers
3
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Matrix Transpose in Python
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Python 2:
>>> theArray = [['a','b','c'],['d','e','f'],['g','h','i']]
>>> zip(*theArray)
[('a', 'd', 'g'), ('b', 'e', 'h'), ('c', 'f', 'i')]
Python 3:
>>> [*zip(*theArray)]
[('a', 'd', 'g'), ('b', 'e', 'h'), ('c', 'f', 'i'...
Quicksort: Choosing the pivot
...er, picking any arbitrary element runs the risk of poorly partitioning the array of size n into two arrays of size 1 and n-1. If you do that often enough, your quicksort runs the risk of becoming O(n^2).
One improvement I've seen is pick median(first, last, mid);
In the worst case, it can still g...
No ConcurrentList in .Net 4.0?
...s involved is miniscule (increment an index and assign to an element in an array; that's really it). You would need a ton of concurrent writes to see any sort of lock contention on this; and even then, the average performance of each write would still beat out the more expensive albeit lockless impl...
Generate array of all letters and digits
Using ruby, is it possible to make an array of each letter in the alphabet and 0-9 easily?
7 Answers
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