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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? ...
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MySQL: @variable vs. variable. What's the difference?

In another question I posted someone told me that there is a difference between: 4 Answers ...
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Why does my 'git branch' have no master?

I'm a git newbie and I keep reading about a "master" branch. Is "master" just a conventional name that people used or does it have special meaning like HEAD ? ...
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Replace a value in a data frame based on a conditional (`if`) statement

In the R data frame coded for below, I would like to replace all of the times that B appears with b . 8 Answers ...
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How to convert a String to CharSequence?

How to convert String to CharSequence in Java? 5 Answers 5 ...
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Docker - how can I copy a file from an image to a host?

My question is related to this question on copying files from containers to hosts; I have a Dockerfile that fetches dependencies, compiles a build artifact from source, and runs an executable. I also want to copy the build artifact (in my case it's a .zip produced by sbt dist in '../target/`, ...
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Change the color of a bullet in a html list?

All I want is to be able to change the color of a bullet in a list to a light gray. It defaults to black, and I can't figure out how to change it. ...
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Why do we need Abstract factory design pattern?

Most of the definition says: 15 Answers 15 ...
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Make a program run slowly

Is there any way to run a C++ program slower by changing any OS parameters in Linux? In this way I would like to simulate what will happen if that particular program happens to run on a real slower machine. ...
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How to write a Python module/package?

I've been making Python scripts for simple tasks at work and never really bothered packaging them for others to use. Now I have been assigned to make a Python wrapper for a REST API. I have absolutely no idea on how to start and I need help. ...