In Ruby, you can concatenate strings using the + operator.
Here is an example:
first_name = "John"
last_name = "Doe"
full_name = first_name + " " + last_name
puts full_name #=> "John Doe"
In this example, we create two strings first_name and last_name and then concatenate them using the + operator to create a new string full_name. We then print the value of the full_name variable.
Here is another example using string interpolation:
age = 30
puts "I am #{age} years old." #=> "I am 30 years old."
In this example, we use string interpolation to insert the value of the age variable into a string. The #{} syntax is used to evaluate the expression inside the braces and insert the result into the string.
You can also use the << operator to concatenate strings:
greeting = "Hello, "
name = "John"
greeting << name << "!" #=> "Hello, John!"
puts greeting
In this example, we use the << operator to append the value of the name variable to the greeting string. The << operator is a destructive append method that modifies the string on the left-hand side of the operator.