## Binary vs Linear searches for unsorted N elements

I try to understand a formula when we should use quicksort. For instance, we have an array with N = 1_000_000 elements. If we will search only once, we should use a simple linear search, but if we'll do it 10 times we should use sort array O(n log n)....

## How to assign the value of one attribute of one array of object to the similarly named attribute of another array of object? – Javascript

This is my codeI have 2 arrays of objects - arr1 and arr2Using these 2 array of objects, I want to create a arr3 variable/array of objects (arr3 will retain the order of arr1 - first London, then NYC, third Paris and last Madrid. I only want to get the...

## types and type variable in Haskell

Scratching at the surface of Haskell's type system, ran this:Somehow, despite en and ec have different types, they both test True on == e. I say "somehow" not because I am surprised (I am not), but because I don't know what is the name of rule/mechanism that allows this. It...

## dplyr group_by over elements of two columns

A simplified version of my dataset can be reproduced by the following:I am looking for a preferably dplyr solution to achieve the following.

## Add delimiters at specific indexes

I want to add a delimiter in some indexes for each line of a file.I have a file with data:And I know the offset of each column (2, 5 and 9)

## Is there any method to safe handle twice freeing memory by delete-expression?

If in theory imagine a situation where, by chance or by mistake (either through carelessness, or due to lack of experience, etc.), the memory was freed twice using delete-exprssion (yes, a good developer will not allow this, in well-designed architectural solutions, but howewer) how to (can we, or is there...

## Invert binary numpy array

is there a kind of "logical no" for numpy arrays (of numbers of course).For example, consider this array: x = [1,0,1,0,0,1]

## Why wasn't TEventArgs made contravariant in the standard event pattern in the .NET ecosystem?

When learning more about the standard event model in .NET, I found that before introducing generics in C#, the method that will handle an event is represented by this delegate type: