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stdin.rb

This Ruby code snippet demonstrates how to read input from the standard input stream (STDIN) using the $stdin.read method. STDIN is a predefined file object in Ruby that represents the standard input stream, which is typically the keyboard. The read method reads all available data from STDIN and returns it as a string.

For example, if you run the following code:

puts "Enter your name: "
name = $stdin.read
puts "Hello, #{name}!"

and then enter “Alice” when prompted for your name, the output will be:

Enter your name: Alice
Hello, Alice!

Note that the read method returns all available data from STDIN, so it’s important to use it in conjunction with other methods that can handle large amounts of input, such as gets or scanf. Additionally, if you are using Ruby 2.6 or later, you can also use the more concise $stdin.readline method instead of $stdin.read, which reads a single line of input from STDIN and returns it as a string.

Additional Note

The line of Ruby code $stdin.read reads input from the standard input (keyboard) until the end of the file (EOF) is reached, and stores the input as a string.

Ruby code snippet

# $stdin.read
#=> nil

Executed with Ruby 3.4.4.