freeCodeCamp/guide/english/ruby/ruby-string-interpolation/index.md

title
Ruby String Interpolation

String Interpolation

String interpolation provides a more readable and concise syntax for building strings. You may be familiar with concatenation via the + or << methods:

"Hello " + "World!" #=> Hello World
"Hello " << "World!" #=> Hello World

String interpolation provides a way to embed Ruby code directly into a string:

place = "World"
"Hello #{place}!" #=> Hello World!

"4 + 4 is #{4 + 4}" #=> 4 + 4 is 8

Everything between #{ and } is evaluated as Ruby code. In order to do so, the string must be surrounded by double quotes (").

Single quotes will return the exact string inside the quotes:

place = "World"
'Hello #{place}!' #=> Hello #{place}!