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Implementing a Reverse Polish notation calculator in Ruby

A couple weeks ago I had a go at implementing an RPN calculator in Ruby. I knew I wanted the calculator to function by popping operands out of an array populated with the values of the input expression, operating upon the operands with the appropriate operator, and pushing the result back into the stack of operands.

I was able to implement this in version 1, but it took forever and the resulting code was not very beautiful. Why?

I started coding before I had a thorough understanding of RPN

Wait, 20 10 5 4 + * - is what now?

Git Cheat Sheet

Basic commands

git init Creates a new git repository in the directory

git add <file name> Adds a specific file to staging

git add . or git add -A Adds the full directory and its contents to staging

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	var process = require('child_process');
	process.exec('ifconfig',function (err,stdout,stderr) {
	if (err) {
	console.log("\n"+stderr);
	} else {
	console.log(stdout);
	}
	});

	Initial linux update

	sudo apt-get update

	sudo apt-get install git-core curl zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev libcurl4-openssl-dev python-software-properties libffi-dev

	rbenv setup

	git clone https://github.com/rbenv/rbenv.git ~/.rbenv
	echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc