string-interpolation

I am just starting to learn Ruby (first time programming), and have a basic syntactical question with regards to variables, and various ways of writing code. Chris Pine's "Learn to Program" taught me to write a basic program like this... num_cars_again= 2 puts 'I own ' + num_cars_again.to_s + ' cars.' This is fine, but then I stumbled across the tutorial on ruby.learncodethehardway.com, and was taught to write the same exact program like this... num_cars= 2 puts "I own #{num_cars} cars." They both output the same thing, but obviously option 2 is a much shorter way to do it. Is there any

I have recently been learning python 3 and I cannot get any examples involving string interpolation (formatting) to work. In [1]: state = "Washington" In [2]: state Out[2]: 'Washington' In [3]: my_message = f"I live in {state}" File "<ipython-input-3-d004dd9e0255>", line 1 my_message = f"I live in {state}" ^ SyntaxError: invalid syntax I figured my machine was defaulting to python 2, but a quick check reveals: Python 3.5.2 (default, Nov 17 2016, 17:05:23) Type "copyright", "credits" or "license" for more information. IPython 5.2.2 -- An enhanced Interactive Python. I am on Ubuntu 16.04:

I want to do the following in C# (coming from a Python background): strVar = "stack" mystr = "This is %soverflow" % (strVar) How do I replace the token inside the string with the value outside of it? Darin Dimitrov string mystr = string.Format("This is {0}overflow", strVar); And you could also use named parameters instead of indexes. Ashtonian This has been added as of C# 6.0 (Visual Studio 2015+). Example: var planetName = "Bob"; var myName = "Ford"; var formattedStr = $"Hello planet {planetName}, my name is {myName}!"; // formattedStr should be "Hello planet Bob, my name is Ford!" This is

The proper way to use string interpolation in Ruby is as follows: name = "Ned Stark" puts "Hello there, #{name}" #=> "Hello there, Ned Stark" That is the way I intend to always use it. However, I've noticed something odd in Ruby's string interpolation. I've noticed that string interpolation works in Ruby without the curly braces in regards to instance variables. For example: @name = "Ned Stark" puts "Hello there, #@name" #=> "Hello there, Ned Stark" And that trying the same thing as a non-instance variable does not work. name = "Ned Stark" puts "Hello, there, #name" #=> "Hello there, #name" I

I'm confused as to why this code won't compile: var result = $"{fieldName}{isDescending ? " desc" : string.Empty}"; If I split it up, it works fine: var desc = isDescending ? " desc" : string.Empty; var result = $"{fieldName}{desc}"; According to the documentation : The structure of an interpolated string is as follows: { <interpolationExpression>[,<alignment>][:<formatString>] } The problem is that the colon is used to denote formatting, like: Console.WriteLine($"The current hour is {hours:hh}") The solution is to wrap the conditional in parenthesis: var result = $"Descending {(isDescending ?