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Can hash tables really be O(1)?
...xpected worst case time if you pick your hash function uniformly at random from a universal family of hash functions. Expected worst case is not the same as average case.
Disclaimer: I don't formally prove hash tables are O(1), for that have a look at this video from coursera [1]. I also don't disc...
Call a REST API in PHP
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The answer from @colan below is way better - it saves you the whole hassle with building your own error handling and wrapper methods.
– Andreas
Nov 10 '16 at 11:08
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C++ catching all exceptions
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This is how you can reverse-engineer the exception type from within catch(...) should you need to (may be useful when catching unknown from a third party library) with GCC:
#include <iostream>
#include <exception>
#include <typeinfo>
#include <stdexcept>
...
How to reference a file for variables using Bash?
.../usr/bin/env bash
source config.sh
echo $production
Note that the output from sh ./script.sh in this example is:
~$ sh ./script.sh
playschool_joe
liveschool_joe
This is because the source command actually runs the program. Everything in config.sh is executed.
Another way
You could use th...
How to get subarray from array?
...have var ar = [1, 2, 3, 4, 5] and want some function getSubarray(array, fromIndex, toIndex) , that result of call getSubarray(ar, 1, 3) is new array [2, 3, 4] .
...
Swift and mutating struct
...answers WHY, by default, the properties of a value type cannot be modified from within its instance methods. you make hints that its because structs default to immutable, but i dont think that is true
– Joseph Knight
Jun 5 '14 at 19:49
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Which $_SERVER variables are safe?
...ues that the user controls and you need to be aware of where a value comes from and hence whether it can be trusted for a certain purpose. $_SERVER['HTTP_FOOBAR'] for example is entirely safe to store in a database, but I most certainly wouldn't eval it.
As such, let's divide those values into thre...
Read String line by line
.... Just because the code is running on (e.g.) Unix, what's to stop the file from having Windows-style "\r\n" line separators? BufferedReader.readLine() and Scanner.nextLine() always check for all three styles of separator.
– Alan Moore
Jul 9 '09 at 6:25
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Twitter Bootstrap alert message close and open again
...u need to place the close button within the alert.
Definition of .closest from jquery doc:
For each element in the set, get the first element that matches the selector by testing the element itself and traversing up through its ancestors in the DOM tree.
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What is the difference between using IDisposable vs a destructor in C#?
... of that description is that MS gives examples of unmanaged resources, but from what I've seen never actually defines the term. Since managed objects are generally only usable within managed code, one might think things used in unmanaged code are unmanaged resources, but that's not really true. A ...