'いろはに'.encoding

str = 'こんにちは'
p str.encoding

p new_str = str.encode(Encoding::EUC_JP)
new_str.encoding

str = "こんにちは"
p str.encoding
p str.encode!(Encoding::EUC_JP)
str.encoding

utf8 = 'こんにちは'.encode('UTF-8')
eucjp = 'こんにちは'.encode('EUC-JP')
p utf8 == eucjp
utf8.eql?(eucjp)

utf8 + eucjp

eucjp = 'Hello'.encode('EUC-JP')
utf8 = 'Hello'.encode('UTF-8')
utf16 = 'Hello'.encode('UTF-16') #non ascii compat
ascii = 'Hello'.encode('ASCII-8BIT')

p utf8 == eucjp
p utf8 == utf16

(utf8 + eucjp).encoding

(eucjp + utf8).encoding

utf8 + utf16