Chenyun Zhang

Unlike other programming languages, Ruby has p, print, puts to print out information to the command line. For Ruby beginners, it might be a little bit confusing to figure out when to use what.

print calls to_s on the object, it doesn’t append a new line.

> print 1,2,3
123 => nil

puts call to_s and add a new line to the output

> puts 1,2,3
1
2
3
=> nil

p calls inspect method and adds a new line. p is more useful for debugging, as it returns the original data type.

> p 1,2,3
1
2
3
=> [1,2,3]

In short:

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