Sorting in JavaScript: Shouldn't returning a boolean be enough for a comparison function?

Sorting in JavaScript: Shouldn't returning a boolean be enough for a comparison function?

I have always successfully sorted my arrays like this (when I did not want the standard lexicographic ordering):var arr = […] // some numbers or soarr.sort(function(a, b) { return a > b;});Now, someone told me this was wrong, and that I

SQL update from one Table to another based on a ID match

SQL update from one Table to another based on a ID match

I have a database with account numbers and card numbers. I match these to a file to update any card numbers to the account number, so that I am only working with account numbers. I created a view linking the table to the account/card databa

How to create a Custom Dialog box in android?

How to create a Custom Dialog box in android?

I want to create a custom dialog box like below I have tried the following things.I created a subclass of AlertDialog.Builder and used a custom Title and Custom Content View and used that but the result was not as expected.Another attempt w

Variable might not have been initialized error

Variable might not have been initialized error

When i try to compile this: public static Rand searchCount (int[] x) { int a ; int b ; ... for (int l= 0; l

Improve INSERT-per-second performance of SQLite?

Improve INSERT-per-second performance of SQLite?

Optimizing SQLite is tricky. Bulk-insert performance of a C application can vary from 85 inserts per second to over 96,000 inserts per second!Background: We are using SQLite as part of a desktop application. We have large amounts of configu

How to merge two arrays in JavaScript and de-duplicate items

How to merge two arrays in JavaScript and de-duplicate items

I have two JavaScript arrays:var array1 = ["Vijendra","Singh"];var array2 = ["Singh", "Shakya"];I want the output to be:var array3 = ["Vijendra","Singh","Shakya"];The output array should have repeated words removed.How do I merge two arrays

console.log() async or sync?

console.log() async or sync?

I am currently reading Async Javascript by Trevor Burnham. This has been a great book so far.He talks about this snippet and console.log being 'async' in the Safari and Chrome console. Unfortunately I can't replicate this. Here is the code

What is the most efficient/elegant way to parse a flat table into a tree?

What is the most efficient/elegant way to parse a flat table into a tree?

Assume you have a flat table that stores an ordered tree hierarchy:Id Name ParentId Order 1 'Node 1' 0 10 2 'Node 1.1' 1 10 3 'Node 2' 0 20 4 'Node 1.1.1' 2 10 5

What are the nuances of scope prototypal / prototypical inheritance in AngularJS?

What are the nuances of scope prototypal / prototypical inheritance in AngularJS?

The API Reference Scope page says: A scope can inherit from a parent scope.The Developer Guide Scope page says: A scope (prototypically) inherits properties from its parent scope.So, does a child scope always prototypically inherit from i

Prototypical inheritance - writing up [duplicate]

Prototypical inheritance - writing up [duplicate]

This question already has an answer here: Javascript object members that are prototyped as arrays become shared by all class instances 3 answers So I h

Anonymous variables in Erlang

Anonymous variables in Erlang

What are the exact differences between underscore variables and a named variable that starts with underscore from the Erlang compiler point of view (apart from adding readability to the code)?For example are _ and _Var different? 1:The d

from sys import argv - what is the function of “script”

from sys import argv - what is the function of “script”

I am reading "Learn Python the Hard Way" and was confused by the "script" part of the second line.from sys import argvscript, filename = argvFrom what I understand, the second line says: script and filename comprise argv.I tried running my

Passing data in the body of a DELETE request

Passing data in the body of a DELETE request

I have two Spring MVC controller methods. Both receive the same data in the request body (in the format of an HTLM POST form: version=3&name=product1&id=2), but one method handles PUT requests and another DELETE:@RequestMapping(value = "aja

In C++11, can the characters in the array pointed to by string::c_str() be altered?

In C++11, can the characters in the array pointed to by string::c_str() be altered?

std::string::c_str() returns a pointer to an array that contains a null-terminated sequence of characters (i.e., a C-string) representing the current value of the string object.In C++98 it was required that "a program shall not alter any of

yylval and union

yylval and union

What is the purpose of union in the yacc file? Is it directly related to yylval in the flex file? If you don't use yylval, then you don't need to use union? 1:The purpose of the union is to allow storing different kind of objects into

Check two float/double values for exact equality

Check two float/double values for exact equality

What is an elegant, readable and non-verbose way of comparing two floating point value for exact equality? As simple as it may sound, its a wicked problem. The == operator doesn't get the job done for NaN and also has special treatment for

Ruby on Rails 4 - simple_form multiple select input

Ruby on Rails 4 - simple_form multiple select input

I have a simple_form input field that looks like this:When I leave multiple: true off, the form submits the chosen value for the parameter :particular_users and I can see the value when debugging using "raise params.inspect". However when I

Why can itertools.groupby group the NaNs in lists but not in numpy arrays

Why can itertools.groupby group the NaNs in lists but not in numpy arrays

I'm having a difficult time to debug a problem in which the float nan in a list and nan in a numpy.array are handled differently when these are used in itertools.groupby:Given the following list and array:from itertools import groupbyimport

Finding the hash value of a row in postgresql

Finding the hash value of a row in postgresql

Is there a way to get the hash code of a row in postgresql? I need to export some data only if there is some changes in the data after the last export, the last exported data rows can be stored in a table, the when the again I need to expo

What is the reason behind std::chrono::duration's lack of immediate tick count manipulation?

What is the reason behind std::chrono::duration's lack of immediate tick count manipulation?

Suppose we have#include #include #include namespace Ratios { typedef std::ratio Days; }typedef std::chrono::system_clock Clock;typedef Clock::time_point TimePoint;And our main looks likeint main(int argc, char *argv[]){ // argc check lef

Cannot Insert Unicode Using cx-Oracle

Cannot Insert Unicode Using cx-Oracle

I am having an issue inserting unicode into an Oracle schema, I think the database is an Oracle 11g instance but am not certain at this point. I'm using python 2.6.1 on OS X 10.6.8 (this is the system verison of python) and am using the cx-

Media Queries: check min-height and min-width?

Media Queries: check min-height and min-width?

I am trying to change CSS on my page based on the min-height and min-width of the browser, so I am using this:@media (min-height: 500px), (min-width: 580px) { /* CSS stuff */}But for some reason, this doesn't work. I can check for min-he

How to combine filter and map in scala?

How to combine filter and map in scala?

I have List[Int] in Scala. The List is List(1,2,3,4,5,6,7,8,9,10). I want to filter the list so that it only has even numbers. And I want to muliply the numbers with 2. Is it possible?I hope I have explained the question clearly. If u have

How can I create a SQLite3 database file using a SQL command file?

How can I create a SQLite3 database file using a SQL command file?

I have a file which contains some SQL commands, something that looks like this:CREATE DATABASE IF NOT EXISTS `db_name`;USE `db_name`;CREATE TABLE IF NOT EXISTS `customers` ( `id` int(10) unsigned NOT NULL, `f_name` varchar(50) DEFAULT NUL

CSS positioning to fill container: width vs. left/right?

CSS positioning to fill container: width vs. left/right?

Considering:For elements that are absolutely positioned inside a relativelypositioned container.If you want the element to fill the width of the container.The element is also bottom-aligned.Is it best for maximum browser compatibility to se