Given a string, how to append a carriage return followed by another string?

Question

I have a string like so string1:

Hello World, join my game:

I would like to make string1 become:

Hello World, join my game:

http://game.com/url

How can I append a carriage return with ruby and then a link from another variable?

THanks

Answer 1

It really depends on what you are outputting to.

$STDOUT:

puts "Hello\n\n#{myURL}"

or

puts "Hello"
puts
puts myURL

or

puts <<EOF
Hello

#{myURL}
EOF

If you are outputting this in an html.erb or .rhtml document:

<%= "Hello<br /><br />#{myURL}" %> # or link_to helper

If you already have a string like string1 then you can append to it using either += or <<:

string1  = "Hello world, join my game:"
myUrl    = "http://example.com"
string1 += "\n\n#{myUrl}"

or:

string1 = "Hello world, join my game:"
myUrl   = "http://example.com"
string +=<<EOF

#{myUrl}
Here's some other details
EOF

Answer 2

Assuming you have these strings:

string1 = 'foo'
string2 = 'bar'

Here's three ways to combine them with a newline in between:

String Interpolation:

"#{string1}\n#{string2}"

'+' Operator:

string1 + "\n" + string2

Array and .join

[string1, "\n", string2].join

OR

[string1, string2].join("\n")

Answer 3

Output as an Array.

If you're appending multiple times to the same String variable and you want to later output each of these appended Strings in new lines, you might want to consider using an Array to store each String in and then just join them with a new line when displaying/outputting them.

output = []

output << "Hello World, join my game:"

output << "http://game.com/url"

output << "Thank You!"

Now, if you're in terminal or something, you can just use puts on the output Array:

puts output
#=> Hello World, join my game:
#=> http://game.com/url
#=> Thank You!

If you want to display it in HTML you might want to use the join() method:

output.join('<br>')
#=> "Hello World, join my game:<br>http://game.com/url<br>Thank You!"

You can use whatever you like in the join() method, so if you wanted to have two line breaks between each string, you could do this:

puts output.join("\n\n")
#=> Hello World, join my game:

#=> http://game.com/url

#=> Thank You!

Answer 4

As far as I know there is no new line constant. Use escape sequence '\n'. like:

puts "1. Hello\n2. World"

Ref: http://en.wikibooks.org/wiki/Ruby_Programming/Strings

Answer 5

If you are using puts statements, a simple way to print on new lines is as follows:

puts "Hello, here is the output on line1", "followed by some output on line2"

This will return:

Hello, here is the output on line1
followed by some output on line2

if you run the code in the irb in terminal.