How do I replace a character at a particular index in JavaScript?

How do I replace a character at a particular index in JavaScript?

I have a string, let's say Hello world and I need to replace the char at index 3. How can I replace a char by specifying a index?var str = "hello world";I need something likestr.replaceAt(0,"h"); 1:In JavaScript, strings are immutable, w

Socket options SO_REUSEADDR and SO_REUSEPORT, how do they differ? Do they mean the same across all m

Socket options SO_REUSEADDR and SO_REUSEPORT, how do they differ? Do they mean the same across all m

The man pages and programmer documentations for the socket options SO_REUSEADDR and SO_REUSEPORT are different for different operating systems and often highly confusing. Some operating systems don't even have the option SO_REUSEPORT. The W

SQL JOIN and different types of JOINs

SQL JOIN and different types of JOINs

What is a SQL JOIN and what are different types? 1:An illustration from W3schools: 2:What is SQL JOIN ?SQL JOIN is a method to retrieve data from two or more database tables.What are the different SQL JOINs ?There are a total of five

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

Why does comparing strings in Python using either '==' or 'is' sometimes produce

Why does comparing strings in Python using either '==' or 'is' sometimes produce

I've got a Python program where two variables are set to the value 'public'. In a conditional expression I have the comparison var1 is var2 which fails, but if I change it to var1 == var2 it returns True.Now if I open my Python interpreter

What is this weird colon-member (“ : ”) syntax in the constructor?

What is this weird colon-member (“ : ”) syntax in the constructor?

Recently I've seen an example like the following:#include class Foo {public: int bar; Foo(int num): bar(num) {};};int main(void) { std::cout << Foo(42).bar << std::endl; return 0;}What does this strange : bar(num) mean? It som

How does MongoDB deal with concurrent updates?

How does MongoDB deal with concurrent updates?

I started to use MongoDB at work so far so good.I was wondering though how does MongoDB deal with concurrent updates ?I've read that there is no locking feature in MongoDB so I was wondering what is the the common practice to deal with this

Change EF 6 Code Generation Strategy from T4

Change EF 6 Code Generation Strategy from T4

In the past I have successfully created edmx files. This was using EF5 and Visual Studio 2012. I have since upgraded to Visual Studio 2013 and EF6. The existing EF 5 code still works, but now I have a problem. I can create edmx files, and a

Does Java 8 have cached support for suppliers?

Does Java 8 have cached support for suppliers?

The guava library has it's own Supplier which does not extend Java 8 Supplier. Also guava provides a cache for suppliers - Suppliers#memoize.Is there something similar, but for Java 8 Suppliers? 1:The simplest solution would bepublic sta

Fast algorithm to calculate Pi in parallel

Fast algorithm to calculate Pi in parallel

I am starting to learn CUDA and I think calculating long digits of pi would be a nice, introductory project.I have already implemented the simple Monte Carlo method which is easily parallelize-able. I simply have each thread randomly genera

slf4j & log4j2 maven setup query

slf4j & log4j2 maven setup query

I am using log4j2 and slf4j in my project & using maven for the build. I am using the following pom file (releveant dependencies shown only) but I am getting the error copied below with this pom file - any idea what I need to add/remove to

How to restore folders (or entire buckets) to Amazon S3 from Glacier?

How to restore folders (or entire buckets) to Amazon S3 from Glacier?

I changed the lifecycle for a bunch of my buckets on Amazon S3 so their storage class was set to Glacier. I did this using the online AWS Console. I now need those files again. I know how to restore them back to S3 per file. But my buck

How to encrypt/decrypt an integer in PHP

How to encrypt/decrypt an integer in PHP

is there any way to make 2 way encryption/decryption for an integer (or string)Please note that I am not looking for encodingi need something like this crypting (100) 24694 crypting (101) 9564jh4 or 45216 or gvhjdfT or whatever ...

SQL sum by year report, looking for an elegant solution

SQL sum by year report, looking for an elegant solution

I have a table with 3 columns: ItemCode, Quantity and DocDate.I would like to create the following report in a more "elegant" way:SELECT T0.ItemCode, (SELECT SUM(QUANTITY) FROM MyTable T1 WHERE YEAR(T0.DocDate) = 2011 AND T0.ItemCode

How do I install lxml on Mac OS X 10.7.4? I have exhausted all options

How do I install lxml on Mac OS X 10.7.4? I have exhausted all options

Tried various avenues but no luck. I am using a MBP with 10.7.4. I don't remember the last time I had so many problems installing anything with Python on my Mac. Please help me use lxml on my local machine and not rely on SVN commits, updat

Modifying emacs forward-word / backward-ward behavior (to be like in vi/vim)

Modifying emacs forward-word / backward-ward behavior (to be like in vi/vim)

What would be the easiest way to have the same kind of behavior that is in vim for the word back and forth navigation? In vim when you press "w" it moves a cursor forward one word, where word consists of a sequence of letters, digits and un

Difference between JA and JG in assembly

Difference between JA and JG in assembly

Can you please tell me the difference between JUMP IF ABOVE AND JUMP IF GREATER in Assembly language? when do i use each of them? do they give me different results? 1:As you could have read in the manual, JG interprets the flags as thoug

QEMU - Code Flow [ Instruction cache and TCG]

QEMU - Code Flow [ Instruction cache and TCG]

I am trying to analyze the QEMU source code.I know its huge and till date there is no official documentation for it.My main areas of concern are the Instruction cache management and TCG operation.Any pointers to them would be helpful ? 1

How to rename table in Cassandra CQL3

How to rename table in Cassandra CQL3

I'm trying to rename table created via CQLSH. E.g. rename table "AAA" to "BBB". Can't find any command to do so. Any ideas?Using [cqlsh 3.1.6 | Cassandra 1.2.8 | CQL spec 3.0.0 | Thrift protocol 19.36.0] 1:I don't believe you can rename

LDAP - How to check a username/password combination?

LDAP - How to check a username/password combination?

Using LDAP is checking a username/password as simple as attempting to bind as that user and noting the results, or is there a special LDAP "check password" function?I'm trying to get a bit more "behind the scenes" understanding while workin

Asynchronous file writing possible in python?

Asynchronous file writing possible in python?

Is there an easy way write to a file asynchronously in Python?I know the file io that comes with Python is blocking; which is fine in most cases. For this particular case, I need writes not to block the application at all, or at least as m

Confused by use of double logical not (!!) operator [duplicate]

Confused by use of double logical not (!!) operator [duplicate]

This question already has an answer here: Double Negation in C++ code 14 answers What is “!!” in C? [duplicate]

Bitwise AND, Bitwise Inclusive OR question, in Java

Bitwise AND, Bitwise Inclusive OR question, in Java

I've a few lines of code within a project, that I can't see the value of...buffer[i] = (currentByte & 0x7F) | (currentByte & 0x80);It reads the filebuffer from a file, stored as bytes, and then transfers then to buffer[i] as shown, but I ca

Uploading project to GitHub from Visual Studio 2010

Uploading project to GitHub from Visual Studio 2010

I have a GitHub account.I have a Visual Studio 2010 with Git Extensions and Git Source Control provider installed.I have created a clean project. How do I upload it to GitHub?P.S. A tutorial on this particular topic would be fine. 1:In

Get pid of current subshell

Get pid of current subshell

I am trying to get the pid of a currently executing subshell - but $$ is only returning the parent pid:#!/usr/bin/shx() { echo "I am a subshell x echo 1 and my pid is $$"}y() { echo "I am a subshell y echo 1 and my pid is $$"}echo "I am t