How to convert a string to lower or upper case in Ruby

Question

How do I take a string and convert it to lower or upper case in Ruby

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Since Ruby 2 4 there is a built in full Unicode case mapping  Source  https   stackoverflow com a 38016153 888294  See Ruby 2 4 0 documentation for details  https   ruby-doc org core-2 4 0 String html method-i-downcase

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The ruby downcase method returns a string with its uppercase letters replaced by lowercase letters    string  downcase   https   ruby-doc org core-2 1 0 String html method-i-downcase

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Ruby has a few methods for changing the case of strings  To convert to lowercase  use downcase    hello James   downcase       gt   hello james     Similarly  upcase capitalizes every letter and capitalize capitalizes the first letter of the string but lowercases the rest    hello James   upcase         gt   HELLO JAMES    hello James   capitalize     gt   Hello james    hello James   titleize       gt   Hello James     If you want to modify a string in place  you can add an exclamation point to any of those methods   string    hello James   string downcase  string      gt   hello james     Refer to the documentation for String for more information

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In combination with try method  to support nil value   string  try  upcase   string  try  capitalize   string  try  titleize

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The  Rails Active Support gem provides upcase  downcase  swapcase capitalize  etc  methods with internationalization support   gem install activesupport irb -ractive support core ext string  STRING                            mb chars downcase to s    gt   string                             string                            mb chars upcase to s   gt   STRING

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You can find strings method like  strings  methods You can define string as upcase  downcase  titleize  For Example    hii  downcase  hii  titleize  hii  upcase

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Like  endeR mentioned  if internationalization is a concern  the unicode utils gem is more than adequate     gem install unicode utils   irb  gt  require  unicode utils    gt  true  gt  UnicodeUtils downcase  FEN BILIMLERI    tr    gt   fen bilimleri      String manipulations  in Ruby 2 4 are now unicode-sensitive

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The  swapcase method transforms the uppercase latters in a string to lowercase and the lowercase letters to uppercase    TESTING  swapcase    gt  testing  testing  swapcase    gt  TESTING

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You can find out all the methods available on a String by opening irb and running    MyString  methods sort   And for a list of the methods available for strings in particular    MyString  own methods sort   I use this to find out new and interesting things about objects which I might not otherwise have known existed

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and the uppercase is    Awesome String  upcase   gt   AWESOME STRING

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Won t work for every  but this just saved me a bunch of time  I just had the problem with a CSV returning  TRUE or  FALSE  so I just added VALUE to s downcase     true  which will return the boolean true if the value is  TRUE  and false if the value is  FALSE   but will still work for the boolean true and false

[ruby] How to convert a string to lower or upper case in Ruby

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