Detect if all letters are lower case [duplicate]

Question

This question already has answers here:

In ruby how do you tell if a string input is in uppercase or lowercase? (3 answers)

Closed 8 years ago.

How to detect in Ruby if a sentence has all lower case letters? Likewise, how to detect if a sentence has all uppercase letters?

You can assume this is an English sentence with no foreign characters.

Simple question, I know. Please excuse brevity.

Answer 1

'string' == 'string'.downcase

If the string is equal to the string with all letters lowercased, then all letters are lowercased.

See here and here.