a = 1
b = 2
"sum: #{a} + #{b} = #{a + b}" # => "sum: 1 + 2 = 3"

"sum: %{one} + %{two} = %{three}" % {one: 1, two: 2, three: 1 + 2} # => "sum: 1 + 2 = 3"

name = "James"
puts "Hello, #{name}"  // Hello, James

vars = { name: "James"}
mystring = "Hello, %{name}"  // content of file, using %{} tags

mystring % vars              // => Hello, James, == string.format

val name = "James"
println(s"Hello, $name")  // Hello, James

let value = 100;
console.log(`The size is ${ value }`);