join an array of substrings into a string in ruby

To join an array of substrings into a single string in Ruby, you can use the join method. Here's an example:

main.rb
substrings = ["hello", "world"]
string = substrings.join(" ")
puts string #=> "hello world"
92 chars
4 lines

In this example, we have an array of two strings: "hello" and "world". We then call the join method on the substrings array, passing in a space character as the separator to use between the joined substrings. The resulting string is "hello world", which we assign to the string variable and then output to the console with puts.