String_Concatenation.md

String Concatenation

Using the + symbol

One way you could concatenate strings is by using the + symbol.

hello = "Hello"
puts hello + " world!" # Hello world!

One flaw to using this method is that you get an error when your string contains a number.

number = 42
puts number + " is the answer to life." # TypeError: String can't be coerced into Fixnum

To counter this, you'd have to convert the number to a string.

number = 42
puts String(number) + " is the answer to life." # 42 is the answer to life.

Using the << symbol

This method is similar to the previous method. You also do need to wrap your numbers with a String() to properly concatenate.

name = "John"
age = 42
sex = "male"
puts "Hi! I'm " << name << ", a " << String(age) << " year old " << sex << "." # Hi! I'm John, a 42 year old male.

String Interpolation

Another, and probably the best, way is by using string interpolation.

name = "John"
age = 42
sex = "male"
puts "Hi! I'm #{name}, a #{age} year old #{sex}." # Hi! I'm John, a 42 year old male.
puts "#{age} is life"